Cool wallet is my choice can use it with any blue-tooth device , and just not usb devices , the only problem is that , they are asking us to keep a backup in-case we lose our bitcoins ,

on their website - (this means they have stated there as in  rules as like below)

Keep the recovery card in a safe place as if it gets damaged or lost, you will not be able to recover your wallet.

more here

https://blog.coolbitx.com/?isa_docs=generate-and-backup-your-wallet

but i wouldn't consider it for safekeeping my best bet would be ledger for huge amount of bitcoins and the bitcoin card / the cold wallet for daily use.

the best bet would be a card like wallet for daily use and a safe like wallet to lock it up !!!



for safekeeping - https://www.keepkey.com/

for daily use - http://www.blochstech.com/  ,  http://www.bitcoincard.org/ and coolwallet.

recovery must be kept safe for all wallets , even for keepkey , so better to split up the bitcoins and write down your recovery key and keep it in a bank safe , thats the best way to safeguard your unused bitcoins.