Electrum is the best wallet in my opinion. However, I think that will be awesome to create a Multisig wallet Desktop.
Noob here: Say I buy a currency with Cryptopia, the secure thing to do is to move the coin to a wallet and not keep it at Cryptopia? I have a Mac and iPhone what wallet should I use and how would I transfer from Cryptopia to that wallet?
You transfer with a transaction.
Avoid phone wallets.
Use the Mac, put a copy of the wallet on a flash drive and stash it away.
The goal here isn't to put it on a device for ready access, but to insure access five or ten years later.