If those are your only 2 options I would go for the Note 4. The note 5 is better and though. But out of any phone I think the G4 would be my top choice. I own the G4 and love it. I have used the Note 5 for a few weeks and it was nice.

I switched from iphone 6 for to a note 4 couple months ago. great switch at first then it gets bland again. Only thing i miss is iMessage, otherwise i don't care if i have android or iOS. Love the removable back for extra storage. It comes down to preference. I'd recommend playing around with whatever OS you're not familiar with. I think i'd rather have a jailbroken iPhone, i haven't tried rooting yet though.

I would get a note 5 I guess the note 4 would be fine to but if your upgrading why not get the newest one. Anyway it honestly depends on your preference, do you like the way Apple does things or do you like android better?

Get the Galaxy Note 4. I am posting this comment from the Note right now and I love it. The screen is great and the camera is great. Its super fast charging is very fast. You can multitask and the pen comes in play so much. Especially if you have snap chat and want to take a screenshot without them knowing pen is great BTW LMAO.. It's big which has to be the best part. Note 4 for the win. Not the iCrapple