Fenix 6 Pro + Polar H10 stand alone option

Hi

I have a Fenix 6 Pro and I am now looking for a chest HR strap to pair with it. I am looking at either Polar H10 or Garmin HRM Pro. The Polar is a lot cheaper now and is one of the best on the market. So I would prefer the Polar H10. My questions:

  1. Does the H10 connect the same as a Garmin chest HR strap would? Meaning: will I still be able to do everything in the Garmin app or will I need the Polar app for some results? 
  2. I will use the 'stand alone' mode and wonder how that works with the Garmin app/compatibility. Does this work just like the Garmin HRM Pro would? Does the H10 send 'stand alone' results directly to the Garmin app?

Thanks for helping me out!