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iPhone4---> iPhone 5.....Restore from iP4 back up or start fresh...
It's usually best to start from fresh... but if you were pleased with everything on your iP4 and all was running well - restore from back-up. And if something goes flaky, you always have the option to go back and do a reset/restore and start fresh later.
Restore should work fine. For me, I took the purchase of the iP5 as an opportunity to start fresh with a clean setup... I only do that at most once a year because of Apple's upgrade/refresh cycle. I would have been restoring from a jailbroken iP4S so that was another factor for me...
So for a notepad app or something like that when you start from scratch and then sync do you gain all your info. I have tons of pages of notes that I can't afford to lose!! I have it backed up through google drive but I still worry!