momma has a Apple Watch, thinking something like the Garmin offerings that look like a real watch doe
You first should break it into:
A) Do you want a smart watch?
B) Do you want a sports watch?
Because really it's clearly divided between those two and there's no watch lineup that works well for both. For a smart watch, you want a touchscreen. For a sports watch, you DON'T want a touchscreen. The nice screens on a smart watch kill battery life.
Make sure it supports the sensor types you want/need. Garmin gets annoying in that they don't support power on the lower end watches, purely to force you into the higher end models. For instance the 245/245M that I use is a great watch, absolutely love it and only take it off when I shower. But it doesn't support power. Nor does it support maps, multi-sport, etc. Would need a 945 for that stuff, or the new 755. But if I'm just riding along and want to record the ride, it's right there and I don't need to bring a head unit.
So my question is, what are your must-have features?
Really the only upsides I see for a head unit:
1) Easier to read on the bike. Bigger display = more fields. Outdoor workouts I would think a head unit is a must.
2) Maps. Which let's be honest, they suck on head units too.
3) Possibly less likely to get destroyed on rocks during a crash.