In a wallet i like to use blockchain because last year my friends bitcoin got hacked and that is when he realized he needed a better wallet and that is when he chose blockchain and told me about
it and i use it too and there has never been any problem at all.
I think this is something which depends on you entirely. I think you should keep your Bitcoin in that way in which you think you are comfortable and feel secure. If you want to hold your Bitcoins, then it is preferable to put them in your wallet. On the other hand you can simply place them in your account if you want to do trading.