I switched from the iPhone to the S4 when it came out 2 years ago.
One feature that Apple implemented in the new iPhone that caught my eye was the Apple Pay. I like the use of virtual account numbers, it's something I use when shopping online and being able to use it in more locations would be great. I've been issued several new credit cards/numbers recently due to places like the Home Depot getting hacked.
I'd done a little research on the Loop Pay, but I didn't see anything similar to the virtual account numbers. However, the Samsung pay has the "tokenization". I've done a little research on it, I'm not sure if it's the same thing as virtual account numbers, but it accomplishes the same thing. My card number isn't actually given to the vendor, so if/when they're hacked, my card is safe. I've started noticing places that I shop if they can handle NFC payments, some do, some don't. I think they'll all be able to handle the Samsung Pay.
I'm looking forward to being able to actually handle the phones. I'll probably give the M9 a look, but I'm leaning towards one of the S6 models. I'll need to see if the Edge does anything worth the extra money.