i mostly have my BTC on paper wallets in a safe, but i do keep a small amount in breadwallet just for showing people and send small amounts. I think for long term storage paper wallets or offline hardware wallets are the way to go, the difference being paper wallets are free, which i like 
I actually store my bitcoins in one application wallet which is coins.ph. This wallet application is really trusted becuase there is so many ways for you to become verified and as a storage of bitcoin i will recommend this app. But is only reliable and applicable to those users who actually needs php because this app can convert you btc into php so that you can withdraw it.