until now, for 9 months, i have been using Coinbase and i have found myself quite comfortable. i have had no problems either with the in transactions nor with the out transactions. the process of withdraw has been safe and easy. i have to say i am not from USA, so maybe that can be a problem to some.
at the beginning i had the problem with the high fees, but after discovering the Gdax (the actual Coinbase Pro) i can do trading and withdraws with no fees. and for sending money to my bank account it is easy. i have tried gemini as well but i had some issues with it. i tried bitfinex as well, but it took me two months just to register, so i did not used it anymore.