Theres no answer to which is better, it depends what you want to do with your crypto. If you want to trade it for other cryptos or for fiat then you can exchange it. If you want to hold it or transact with it then you would need a wallet. I suggest you check out www.xinfinity.io <--- its a unified cryptocurrency wallet that holds ANY crypto due to its cross-chain features. Its a live application available on android and IOS that has a built in crypto exchange.