I used so many online wallets like coinbase,Blockchain etc but i didn't use coinbase as it's frozen people's bitcoin sometimes and blockchain because of downtime.Now i only Use Electrum and i think most secure online wallet and very easy to use.
All wallet you use is indeed a very nice wallet or the recommendations of most professional or master who already use bitcoin away from us. Did not cover the possibility that each wallet has a policy and limitations, so we had to find one among them who are indeed suitable for use in us or in our needs. Electrum is indeed very good, but it's not necessarily good also for those who already feel that the blockchain, coinbase or another better wallets