the best web wallet for now only blockchain we can access it from website and mobile app so easy to access and we can set the fees low or high and the security feature is good enough like email and sms verification 
If we are talking about web wallet, Blockchain.info maybe a great web wallet over Coinbase or Xapo in my opinion well at least they won't froze your account for illegal activities not like Coinbase. To exchange your Bitcoin to real money, you can go to Currency Exchange section and make a trade with member in here. Make sure to use reputable Escrow and trustworthy member. and for friendly reminder that never leave your funds at any exchanges it's not a safe place
And with the news on August 1, this is a good chance to move your money to better place.