The best wallet which i think is most secure also is Xapo. It offers Vault also for cold storage. Also there is no transaction fee involved in this. So it is the best.
You can keep your unused coins in Cold storage called Vault and it is the most secure amoung all the avaible wallets on the internet.
I think the important thing from a wallet is not a fee-free dude but it is the safety of the wallet?
if it is not safe. would be gratuitous transaction fee is free.
do you think of online wallet xapo vs blockchain where the most secure?