I've used Android Pay pretty extensively (live in California), and it's been flawless. The fingerprint scanner is as good as iPhone Touch ID. In general Android Pay is actually faster than Apple pay in that you simply unlock your phone, place near scanner, done. Whereas Apple Pay needs then prompt to pop up when near the scanner, and then you scan your fingerprint. However I prefer Apple Pay because I feel like it's more secure due to requiring your fingerprint to pay vs simply unlocking the phone.
Yeah I managed Android Pay once, and expected it to work like Apple Pay. It didn't, and only did when I unlocked the phone. Feel a lot more secure using Apple Pay.