I don't use Trust wallet but I know it is open source unlike Coinomi. That's probably an added advantage over other mobile wallets.
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Though i am not sure it's a good idea to store too much on such wallet, assuming it's not decentralized wallet and not used on a safe mobile device. It's probably better to use the wallet for storing coins(few coins especially) you want to spend short term
When it comes to wallet, it's either custodial or non-custodial (both Trust wallet and Coinomi are non-custodial). I do agree that it's not ideal to store crypto in mobile wallets for long term.
That is true, I use coinomi too to store my altcoins. Because it is really easy to use, I only need to download coinomi on google play and install it and keep all my private key secretly in order to avoid some bad thing come. Other than I use I'm Token to store my ERC20, seem like it very easy to use rather you choose myetherwallet. Because currently, you need some effort if you use myethereallet comparing to I'm token you just need to download it and install it on your phone and you can check your token simply.
You should read the OP again. He/She is basically saying that Trust wallet is better than Coinomi.