What’s the best smartphone wallet?

Following up on an AMA reply by Justin Drake, I'm curious about what the best software wallets are right now on mobile phones. I've seen Coinbase, Metamask, Rabby, Rainbow.

I like the browser feature in Coinbase even though it's kind of shit. I find that my regular web browser often fails to transition to signing with the wallet app so going directly through Coinbase Wallet works better.