If you wanna day trade or if you wanna be ready when it pump exchange will be the option , But if you are doing a Long hold that doesnt matter when it pump or dump much better in wallet because you would not panic or be tempted to play with it that will cause you loses.
i think taht wallet can be a little bit ssfer, but still it is up to yku to fecispde apwaht to do apin your curret situation