Recommendations needed for fitness watch to buy

Please recommend a good fitness tracking wristband / watch. I need accurate pulse, BP, SPO2, activity tracking (walking, cycling, yoga), and ECG. I have a OnePlus 5 phone and do not want to buy another phone.
Have used a Fitbit Charge HR and was very disappointed with the life of the watch i.e. 18 months (happened to me 2 times)

Comparing fitness trackers with LED displays Polar Loop or SafeBand?

I was searching for activity trackers which have LED Fuel Band like displays. The very first result was Polar Loop.
Then I tried to find something more functional on Kickstarter

Actually that Band seems to be better with its "safety" functions, but there is one problem - the project has stopped fund raising.

So what do you think? Is it better to buy Polar Loop right now or wait for the start of new crowd funding campaign of that Safe Band project?