Metamask wallet was a long time in the making and can be run on most mobile devices that can install apps. As we can see from the tagline on the main site page the goal is to provide users with a single entry point into the Ethereum network and the decentralized applications (dApps) it hosts.
To go back to the original goal for this wallet as "a gateway to blockchain apps" I can honestly say they really have hit their mark. By far the best functionality is the dApp browser section and the easy with which you can find and interact with these is brilliant. In some way this is cleaner and easier to us than the desktop plugin version and much easier to find/keep track of the most well known DeFi sites. For me this kind of an app really goes a long way to support adoption as it puts everything a non-veteran ETH user needs in one place.
What I would say for anyone thinking of making the switch from Atomic, Trust, Coinbase, or any other ETH wallet, or perhap just wanting to be able to access their decentralized finances on the go then this is probably the app for you. However, a word of warning do not go down the route of creating a new wallet and transfering funds in. You'll just be throwing gas (and liquidity farming positions) down the drain. Insead follow my guide here to just link your existing ETH wallet address through MetaMask. You don't need to change ETH address just because you changed your wallet (let's face it if we had to throw out our credit cards and cash each time we bought a new wallet or purse we'd be mad!).
Remember as well if you commonly use the Brave Browser built in crypto wallet (a fork of MetaMask) you can also link that to your MetaMask app. Try the app out for yourself, if you're a keen DeFi enthusiast I'm sure you'll love it.