So far, blockchain.info is the most used online wallet and many user already recommend this, in terms on their security and easy to use. When i was a newbie to bitcoin, i made my first wallet on that site.
I don't want to derail the conversation but for me, desktop wallet is the best.
The blockchain is the best in my opinion because its secure its fast never had problems with and they can also be trusted for sure.
The blockchain is indeed the best online wallet, I honestly do not like online wallets but if I have to pick I would pick the blockchain without any doubts.