Exactly the info I was looking for.
I understand a personal cold storage device is always the best option for holding currency, but for anyone who's trading alt coins, it's best to have something convenient and versatile.
At first, I was looking into using Jaxx as my mobile wallet, and maybe I will in the future as you said, but it doesn't have the coins I need. You say Coinomi is secure, and THAT was my main concern.
Awesome post for a newb like me!