JAXX wallet has a new overall design with integrated exchange for mobile.
Jaxx is closed source wallet, you should avoid it.
You can try using exodus, it's good option if you want to hold little amount altcoins. But, if you want to hold large amount altcoins, I suggest to use ledger or trezor wallet for better security than web wallets.
Personally, I never use coinomi... but I think you should read this
WARNING - Coinomi Wallet CRITICAL Vulnerability Made Me Lose My Life Savings and think twice before you want to use it
If you want to hold bitcoin, like anyone said... you can choose electrum. Because it's safe and easy to use for both newbies or pros
The problem with coinomi been vunerable to attacks only affected the desktop wallet Version and I think it's been fixed, I've been using coinomi mobile Wallet for a while and I have no problem with my coins