I'm trying to get a good wearable tracker to help monitor my health and weightloss. I have a pixel phone. I saw that the Galaxy W4 had possibly better hacks for the Pixel than the W5. Any truth to that?

I want to track, o2, ECG, blood pressure, steps, elevation, calories, sleep, but I especially wanted perspiration and body temperature tracking but can't seem to find that outside a Fitbit sense 2 in my price range. Calls and smart features aren't as Important to me but I'll take them.

I like the Garmin venue s2 plus but I can't justify it bc it doesn't have everything. so I found refurbished galaxy watches on eBay for cheap and figure they are the best you can get for $89-$140 so why not.

Get a GW4 with my pixel and a GW5 to go with my partner's Samsung phone.

It looks like there's not too much difference in the 4/5 besides battery unless you go to the pro 5, but I'm not going to spend that much on a pro. So is the 5 so much better than the 4 if used on the Samsung phone and hacks aren't needed?

Any recommendations?

Is it true on the 5 if I set my location outside the US the ECG and temperature will work or is that only a Pro 5 feature?