6P - I am Note 4 user and have become used to the bigger screen. Not sure I can go back to a smaller phone now. The 6P also seems to have slightly better performance when it comes to the camera and battery life.
Because I just spent my entire weekend trying custom ROM's out and eventually downgrading my Motorola Razr Maxx back to stock Jellybean. The Kit-Kat update ruined the battery life, the already mediocre camera, and audio quality. Have mercy.