Help me decide on my next phone!

Okay, I'm sure this gets asked here all the time, but I'd love to hear everyone's input! I'm switching to T-mobile from Sprint (good riddance) and am carefully pondering what's next. I currently have the Galaxy S6. I do a TON of gaming on my phone since I have a lot of downtime at work. I've been leaning towards the G4 but I'm also considering the Note 5.