I've used MEW - but they have a warning about phishing attempts and people losing their private keys.  I got a Ledger and have been very pleased.  I use it with MEW, and it requires you to physically hold it to spend.  As long as it is not lost, a hardware wallet is probably the most safe way to hold and move crypto.  Was reading something by Mike Belshe from BitGo (a crypto security trust company) and one of the tools they use is a ledger for whales.