Garmin
Forerunner 255 Series
Long battery; but wrist HR tracking is inconsistent.
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The gbx 100 is so much better/cooler than the GBD 200 bc it looks nicer with the metal bezel, and softer more breathable band for designed to withstand sweat and saltwater (it's a surfer watch). Also has cooler surfer related menus with nifty graphics and is also MiP display. It's a bit more expensive tho but well worth it imo just for the comfort and looks.
I have both the GBD-200 and -300, purchasing the 200 first. Found the 300 on eBay for a great price and picked it up. Since then, the 200 has done nothing but occupy a space in my Casio box. The round case just looks so much better to me.
I have both. Bought the GBD200 when I didn’t know the GBX100 existed. Was looking for a watch with a tide function and found the 100. They are very similar watches except for the moon/tide feature. The 100 is a much nicer looking watch for day to day wear too. If I knew of it before 200 I wouldn’t have the 200
I have the 300 because it was cheaper at the time, but I think in the dark colour the 200 looks better (the two tone doesn't work as well IMO)
The first one-GBD-200 is better. The screen is more flush with the case and has a slightly better viewing perspective. Unless you live near the beach and surf, you won't use the Tide function of the GBX-100. A positive MIP version is coming out this month. [https://www.youtube.com/watch?v=mj49V8a4c1c](https://www.youtube.com/watch?v=mj49V8a4c1c)
I love the GBD200 for simple tracking and great if you don’t care about heart rate or more advanced metrics. https://preview.redd.it/95590tentt8g1.jpeg?width=1179&format=pjpg&auto=webp&s=47088cdf5da22bb6c987a75ffe262c26993285e1
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

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Apple - Ultra Series

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Garmin - Enduro 3

Ranked #1
Garmin - Fenix 7 Series

Ranked #1
Garmin - Forerunner 255 Series

Ranked #1
Oura - Oura Ring Series