both of them are good options

regarding fees you need to check each exchange and see how much they are charging you for it. but it usually is 1-2 Doge for dogecoin so it is cheaper.

and based on number of confirmation each of them requires they can be the same speed like one another.

but as i explained above Doge has a lower price so buying in one place and selling in another (if you want to buy and sell at market price) means losing a large amount of money.