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

Running these analyses costs money. Buy through my links to help keep lights on! I may get a small commission.
I'm using a Race 1 and also have an Enduro 2. I use the Race 1 now. The two things that I miss from the Enduro are: contactless payments and the flashlight, although the race does have a flashlight mode for its display. It's also easier to get routes onto the watch, because Suunto imposes a limit on the number of courses, and course management is buggy. Conversely, Garmin course management is just clunky. I like the training load implementation on the Race, and love the display. The maps implementation also suits my usage really well. I find it to be very fast and responsive. I also like the form factor. The Enduro was a brick that would get caught on every sleeve. Also, for my usage, the Race gets better battery life. Garmin will provide many metrics - and I don't use many of them. I find some to be of dubious value, and I simply don't care about others. But some people like them - I'm just not one of them.
I have had every Garmin since the Fenix 3. Recently picked up the Race. Not sure I’ll go back to Garmin. The watch itself feels years ahead of Garmin. The Fenix line has more or less had the same case since its inception. Suunto app is more user friendly and cleaner IMO. Currently testing a Coros Nomad. If that doesn’t suit my fancy I will definitely be picking up the Race 2. (Still In the return period on the Race 1)
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.
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.

Ranked #1
Oura - Oura Ring Series

Ranked #1
Apple - Ultra Series

Ranked #1
Garmin - Enduro 3

Ranked #1
Garmin - Fenix 7 Series

Ranked #1
Garmin - Forerunner 255 Series

Ranked #1
Oura - Oura Ring Series