I'd consider that a large sum, and if I had that much bitcoin I'd probably spread it out between a few wallets just to be safe--although the suggestion of using a hardware wallet exclusively isn't a bad one at all, as long as you keep the seed phrase safe.  It all comes down to that: securing the private keys to your bitcoin once you've chosen a secure wallet.

And I think using Electrum to hold 1BTC should be fine as long as you can ensure you don't lose your backup(s) or seed words.  It's my favorite software wallet, and I've tried using a lot of them. 

Good advice.  I think for probably most members on this forum, a whole bitcoin represents a lot of money and in some cases it could be someone's entire life savings--even at today's price of $31k.  But even if it's not a huge amount to some folks, it's still probably too much to be lax about.  I don't think even wealthy people would feel good about losing $31k because they got hacked or somehow lost access to their wallet.