Hi. I'm thinking of upgrading to a new MacBook Air or Pro and wondering the best way to go about migration. I think I'd ideally like to start fresh and just move across / re-download the apps/files I want, rather than just copying the full content of the old one across. Bit concerned though that iTunes/AppleMusic and iPhone syncs etc. could be messy though, because well... it's not the nicest software! Any thoughts / advice?