Simplycash has been my go to for sometime but really only until I have enough in it to need to start pushing to paper wallet. I only like to keep like 20-40 bsv on simply cash then I start putting on paper wallets in increments of 3-5 BSV per wallet address. (Bitaddress.org) 
This way if hacked they would only get some of my BSV not all. These dumb asses with the cold card hack are stupid fucks. They keep all their stash in 1 spot. You become a target when the wallet has million + in it . It’s public and hackers will target big wallets. I’d rather have a thousand wallets with 1 BSV in em