Hi @Ryan1!
You might find a previous post I wrote comparing Binance to Bittrex useful.
Keep also in mind that for now, it is only possible to buy ADA with fiat only in Korea (Coinnest and Upbit), along with the australian Coinspot. it is more expensive in fees to buy straight with Credit Card, but faster. Wire transfer is the cheaper option, but takes longer to get credited.
Cheers!