I would say it depends on what your goals are:
1) Garmin watches are much more accurate in terms of health metrics and monitoring.
2) Samsung's watch 4 has lots of features but a very inadequate battery life, and inconsistent measurements
3) We have good smartwatches from Fossil and Mobvoi Ticwatch as well, which are great.
I personally use the watch 4 classic and had watch active 2 previously.
Watch active 2 has a few major shortcomings:
1) Samsung's own OS is used. The Google-Samsung collab WearOS3 is not there on watch active 2. So, it wouldn't support google services and apps. Tizen OS is quite outdated.
2) It has 2.6 GB usable storage which is quite low, usually.
3) The metrics aren't accurate
4) A relatively not so smooth experience.
I would recommend you to look at Ticwatch, Fossil watch, as well as Samsung Watch, in case Apple Watches aren't what you want. Amongst Samsung, since you already have watch active 2, don't go for 3. Definjtely not worth it. Go for 4 directly. I am a huge fan of the rotating dial.