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

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Fenix 8 Solar 51mm. 22d. No workout tracking, no notifications. Just passively tracking my life.
I was holding out for the 8 Pro, but after the reveal I went with the 8 51mm Solar. I am team MIP display and that not being an option on the 8 Pro I was immediately turned off on it.
Im in garmin ecosystem for 1 year and I dont see such problems as other users. I mean, im using a Fênix 8 51mm solar now and didnt notice bugs and the battery doesnt reach as much as advertised, but performs very well. My former epix 2 had some bugs, but Garmin fixed. Charging port its ok. However, my old t Rex 2 from amazfit had magnetic charging port, which was nice.
I went from a Fenix 8 Amoled 51 to a MIP 51; the Amoled seems like a cheap watch to me, and the MIP a serious work tool.
51mm F8 Solar, graduation gift in Dec ‘24, no issues other than still being annoyed my wrist size is right in between holes on most bands.
Have 8 Solar 51mm since the very launch. More than happy, no issues. Make 1.5 hour GPS activity every day, charge once a 12-14 days.
I have my fēnix 8 solar since its very release about 1.5 year ago. As far as I remember there was no serious issues at all.
It all depends on your personal attitude towards the issue. I personally am leaning towards buying the watch when I need it and not not when the new models will be issued and nobody knows when. That's because I desire to take an advantage from my watch right now, not sometime in the future. If the release of 9 would be tomorrow and for sure, this can justify the delayed purchase, but this is definitely not a situation. Yes, I forgot to say, I am very happy with my fēnix 8. Great purchase.
As far as I understand F8 have more features. Such as longer battery life, additional features for golf, quite better look. These options costs £250 more. You just have to cut if these features justify an extra payment. In my opinion they definitely do. But that's should be your decision. BTW if you ask me, only longer battery life justify a purchase of F8 instead of FR970
Little disclaimer. I have F8 Solar for more than a year and I love it. I activate GPS for 1-1.5 hour per day every day and the battery lasts for about 12 days (from 100% to close to be empty). If I wouldn't activate GPS it lasts up to 27 days - GPS is a battery killer. Take it into your considerations. That's why I stated that longer battery life only worth to go for F8
I personally didn't find Elevate 5 more precise nor accurate than the 4. I've upgraded fenix 7x to fenix 8, so I had a chance to compare. Actually the main purpose of this switch was to improve the accuracy of hr tracing. I also was convinced that results of chest strap and elevate sensor are very different from each other.
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

Ranked #1
Oura - Oura Ring Series