Managing multiple wallets

A question and please forgive my ignorance, what’s the best way to manage multiple wallets? Particularly if buying/holding multiple alt coins?

Also, is it wise to have multiple wallets for the sake of diversity and additional security? Not “all my coins in the same basket”?

I currently have a KeepKey with my cold storage of three different coins. Just got a Ledger Nano S, which I think is going to be my more portable wallet. Never really considered multiple coins in one device being an issue. Just make sure you have your 12 words and a nice pin, or you’re gonna have a bad time eventually, I figure.