Ledger nano s is the best to store stratis for sure. It is the most securest way but if you don't want to buy a hardware wallet, coinomi can be also preferred.
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The best for this is Ledger nano S hardware wallet. There you can keep Bitcions, Ether, Stratis, Komodo, all ERC20 tikens, Ripple, Zcash etc... Very recommended to buy. it's safe and easy touse even on pc with viruses and malware. Best security ever