You are wrong, trustwallet has same feature as metamask, you can also add new network or new token right on trustwallet wallet. Now, I no longer use trustwallet on my phone so I cant guide you, but I remember exactly I used to use trustwallet to add new tokens. But if you often use your computer to work, then metamask is a better choice as it has both browser and mobile versions.
I never heard if trust wallet has such feature exist before. I only heard that if you will be able to adding the new network when you will be create a new wallet. I meant when you are creating a new wallet and trust wallet will give you the list of chains that already supported by it. I never heard that if trust wallet is having a manual feature to add the blockchain like what already available in metamask. IMO metamask is the most friendly wallet for any blockchain for now.