I don't know if it's the best but the Garmin is good. My wife and I both have been using them for 5 + and we are very happy with them, no problems at all. When I had my polar I had to send it back when the battery needed replacing, with the Garmin it's easy to replace.

Once at spin class the spin bike I was using broke so I jumped off and got on one on the other side of the room. I forgot to take my monitor with me. I expected most of my workout to be missing. When I got home and downloaded my workout it was all there. So Iv'e never had reason to look at anything else.

Dave