The nicest thing about having an S7 Edge with an SD card is being able to eject the card, eject the sim tray, add anything I want to the card by plugging the card into my Mac and then putting the card back into the phone with the sim card without ever having to turn the phone off.
On my Surface Pro 3, I just connect the phone to the computer with a cord and the card shows up along with the phone and I can directly drag and drop what I want without ever having to remove the SD card. They just show up in explorer.
You should try an S7/Edge and just see how you like it. It might be one of the best decisions ever.
I recently looked into their test drive, but I think that's dead. Switching my wife over will be more difficult as she waited for the SE as she likes smaller phones. Since we send kid pictures and videos a lot I figure it'd be easier on the same platform. But those are definite positives.