@kevo_55 I ended up with the Garmin Forerunner 235, and my fiance has the VIvoactive 3. The battery life on mine way eclipses the battery life on his. I run it for about 16 or 17 hours a day, using it actively for about 1.5 hours of biking 3-4 a week and runs (let's say 45 min to 1:15 in duration) 2x a week, take it off and turn it off at night, and charge it
maybe once a week? I feel like my fiance is charging his Vivoactive a couple of times a week (granted, he also uses it with more connectivity with his phone).
I quite like mine for my bike commutes and running, and I think I can do other activities on it too (though I don't). In terms of looks, it's much sportier looking than the Vivoactive, which is much more like a smart watch to me. The Forerunner 235 can receive texts if you want it to, but that's about it, I think. In any case, I use it for my workouts and quite like it, and in fact have transitioned into using it as my full-time watch (I have gotten the occasional comment along the lines of, "Um, are you about to do a triathlon or something?" since it looks so sporty, but that doesn't bother me).
The only drawback I'd say I have with the Forerunner 235, having now used it consistently for about 9 months, is the heartrate monitor. I got the one that has the heart rate thing included in the watch, and what that means is it has a raised bumped on the backside of the watch face that pretty much always leaves a mark on my wrist. The heart rate monitor in the Vivoactive 3 is not raised and thus, I don't think that my fiance has this issue at all.
The Vivoactive 3 is much sleeker looking and my fiance has gotten compliments on it as a watch. He really likes it in terms of its capabilities, and uses it for bike community (1 hour) 5x a week, two runs around the same duration as me, and perhaps a long bike ride (anywhere from 20-40 miles) 1x a week. He's definitely actively using it more than I am, but even so, I've read the battery life of the Forerunner 235 is better overall in direct comparison.
One thing to note is that that Garmin app seems to have more capabilities when being used on an Android vs. and iPhone. I have an Android, fiance has an iPhone, I do have a few more metrics available in the app, but it's not a big deal either way.
Hope this helps!