Opinion; which wallet is the best?

My opinion is Blockchain because have minimum fee than other bitcoin wallets, everywhere support it have official app for Android and IOS, have security levels you can consider which is very useful for more details see this post:

Click here: 3 Reason why you should use blockchain instead all other block chain web wallets

https://ways4btc.wordpress.com/2017/07/01/3-reason-why-you-should-use-blockchain-instead-all-other-bitcoin-wallets-comparison/

Click here: 3 tips you should consider to have maximum security in your blockchain wallet

https://ways4btc.wordpress.com/2017/06/29/3-tips-you-should-consider-to-have-maximum-security-in-your-bitcoin-wallet-blockchain/

All is good. The choice is yours.