Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.

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Gone from fenix 6 to 165 for lower weight, now Race S titanium and it feels so much nicer to the point I forget I'm wearing it. App wise Garmin has too much and Sunnto has too little for me. Only one watch face installed, but more can be downloaded but its limited No gear tracking Not real challenges or proper badges, good motivation for me Sunnto has so many activities to use where as my 165 was vastly limited for no good reason other than to get me to buy a more expensive watch. Love the "chores" activitie and makes more put more effort into stuff like gardening I will stick with Sunnto as I love the actual watch and the app does cover the essentials, also nice to give a big "F You!" to garmin for the paywall crap and overpricing!
Tried a polar vantage v3. Managed to break the glass within 3 days ( in the same way that merely left a few scratches on my Apple Watch 3).Luckily the retailer refunded it. Now have a Suunto race titanium and it feels much more solid. I went for Polar because of “buy from EU” but I’m much happier with the Suunto.
I have a Race S Titanium and LOVE it. It's an amazing watch for my needs, which are primarily backcountry-related as well as weight training and gym cardio work. The face size and thickness are super non-intrusive, build quality is superb, and with the right strap it can totally blend in to the background and look slick and not sporty. I use it as my daily driver, wear it to an office job, and love it. With that said, if your primary sport usage is road running and you like to closely track metrics, I would consider the Garmin. My understanding is the metrics and tracking on Garmins are a bit more detailed and exhaustive, especially for runners. You can then pocket the remaining 45 euro, or put it towards a proper HRM if you don't have one (or whatever). TL;DR: In my experience, Race S is excellent. For your uses, maybe 900-series Garmin good for running-focused training.
I got a Suunto race S for the same purpose. Long battery life and gps signal (nearly) always works outdoors. Maps are free, without subscription. Watch is not too big to wear all the time. You can upload routes from your phone. Downside: tiny screen.
Race S Titanium is very light and less clumsy on my wrist as I intended to wear it full time and it was cheaper than vertical. The battery life is sufficient for me. After a few months, I’ve gone back to my Apple Watch 10 for everyday use as the fitness metrics of Suunto don’t work well for me. However, I like the Suunto for hikes. I use the altitude and weather alerts a lot. I plot my routes myself or download them on my phone and import them onto the Suunto app and then the watch. Very easy. The long battery life of the Vertical is attractive but it is one lump of a watch. It might be worth trying to find a stockist where you can try it on.
I recently bought a Suunto Race S for that purpose. It has subscription free maps and several days of battery life. It is sturdy and light; I have the titanium model. Of course the map is tiny, but as my third means of navigation (after phone and paper map) it is good enough. It will get me back to my car if all else fails. Fitness and sports wise I prefer the Apple Watch as the Suunto data are more detailed and complex than I need.
All day and more remote areas? I got a Suunto Race S. The battery lasts several days with full display, navigation etc. the GPS is independent from any phone and the screen shows (tiny) maps. It also has a barometer and shows accurate elevation.
Indeed, I live my AW for everyday use too! the battery life on the Suunto is superb and having a navigation tool that is autonomous adds to my safety
Really depends on your expectations. Garmin provides more detail in some cases and is probably better if you like all of the info you need plus more. It will be better with gym workouts, may be better with intervals and other little things that some users enjoy. It may be better with smart features as well, if that's of any imporance. Suunto provides a more streamlined experience. The buttons and interface are much nicer and more intuitive, app provides more pertinent info about your workouts, and the build quality is much nicer (though Garmin's quality is certainly more than good enough in most cases, just different design choices). I think most would say that the Suunto is much nicer looking as well. Either will do that job and do it well, both are overkill for most of us. Battery life is really a non-issue in either case, unless you have a specific need that requires every last minute of battery. I personally moved to the Race 1 Ti after trying the Race S and 965, moving from the 955. I much prefer the Suunto and wouldn't hesitate to recommend it, as long as the user has reasonable expectations. I really didn't care for the interface on the 965, though it sat well on wrist. I also don't care for the 5-button layout, seems ridiculously complex and unintuitive. It works once you figure it out, but needs to be rethought. Good luck with the decision, both are good tools and will get the job done.
Really depends on your expectations. Garmin provides more detail in some cases and is probably better if you like all of the info you need plus more. It will be better with gym workouts, may be better with intervals and other little things that some users enjoy. It may be better with smart features as well, if that's of any imporance. Suunto provides a more streamlined experience. The buttons and interface are much nicer and more intuitive, app provides more pertinent info about your workouts, and the build quality is much nicer (though Garmin's quality is certainly more than good enough in most cases, just different design choices). I think most would say that the Suunto is much nicer looking as well. Either will do that job and do it well, both are overkill for most of us. Battery life is really a non-issue in either case, unless you have a specific need that requires every last minute of battery. I personally moved to the Race 1 Ti after trying the Race S and 965, moving from the 955. I much prefer the Suunto and wouldn't hesitate to recommend it, as long as the user has reasonable expectations. I really didn't care for the interface on the 965, though it sat well on wrist. I also don't care for the 5-button layout, seems ridiculously complex and unintuitive. It works once you figure it out, but needs to be rethought. Good luck with the decision, both are good tools and will get the job done.
Sounds like the AWU is all you'll need for 50k. I use the Suunto Race and it's great. Really good GPS and HR is fine with a chest strap. It generally works fine without one, but occasionally picks up on your pace. I really like what Suunto offers, and what it leaves out. The Coros Pace could also be perfect, inexpensive and reliable for the longer events. Good luck with your runs!
It has HRV but not during activities but very few devices can do that, even high end models from Garmin. If you want that the take a look at Suunto with ZoneSense.
Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.

Garmin
Forerunner 955 Series
Best value, clear MIP screen; limited smartwatch features.

Garmin
Fenix 7 Series
Durable, multi-week battery, flashlight; high price, buggy software.
Garmin
Instinct 2 Series
Rugged, solar multi-week battery; bulky, small screen readability issues.

Garmin
Enduro 3
Multi-week solar battery, lightweight; but bulky form factor.

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Oura - Oura Ring Series

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Apple - Ultra Series

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Garmin - Enduro 3

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Garmin - Fenix 7 Series

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Garmin - Forerunner 255 Series

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Oura - Oura Ring Series