Coinbase has been pushing their own standard, WalletLink.
How does it compare? They have it open-source. Both allow connect and sign transactions, with WalletLink also allowing multiple and also persistent connections with dapps that users don't need to sign in again all the time.
(Article) New Coinbase Product Links Mobile Wallet With Dapps
Coinbase created WalletLink to connect its mobile wallet with dapps on desktop browsers. The goal is for Coinbase wallet users to use decentralized applications more easily, without having to copy and paste addresses or use browser extensions.Users will scan a QR code that will connect their mobile wallet with integrated dapps, and they’ll confirm transactions via a ping on their phones.
Some were quick to point out that WalletConnect offers the same service and works with any wallet, to which Coinbase employees responded that their product is open source and for everyone to use, and that they tried to make it easier to integrate than WalletConnect. Competition usually helps a free market, and Coinbase has 30 million users, so the news is likely positive for the space.
User flow