what do you use wallet or exchange for? Do you want to trade or hold ?
If you hold on a mid term or trade, you should use exchange. And hold your coin for security, you should use hardware wallet.
It depends on some factors:
- if I'm going to trade, of course I will chose exchange
- if the amount is not big, than it does not matter what to use
- if I'm going to hold, of couse I will choose a wallet because it is safer