Well, the note 4 will most likely have a 2560x1440 display that is 5.7"+. Powering all those pixels will almost certainly be the snapdragon 805 with 3 gbs of ddr3 ram. According to extremetech the 805's cpu is only about 5% faster than the snapdragon 801, but the gpu is 40% more powerful. Keep in mind though that a 2560x1440 display has to push 77% more pixels than a 1920x1080 display. It's also worth mentioning that battery life is supposed to improve by something like 20%. In the end I think either device will be a great choice, but the note 4 may be worth checking out if you still have something like a 5/5s and are ok with the size. If you're more comfortable with a large phone as opposed to a giant phone, then go with the S5