All those payment systems have been the subject of hackathons and other security articles. Given the recent news at anyone that sideloads and uses these Androids for payment are (excuse the bluntness) fools.

I carry the LG G4 as my main phone and if it dies, I'll shop the G5. Samsung lost me over their debacles with tablet registration and KNOX losing a friends phone contents. Good thing they knew "you only lose what you don't backup."

Then again, I'm a big fan of the 99 buck unlocked smart phones. I have a few on my desk "for research." These are found on Amazon.