Is brave the only browser with fingerprint randomization?

Yes. Brave focuses on providing random data points each time it's asked (e.g. screen size). A hardened Firefox will try to provide a generic fingerprint.

Apples to oranges more or less, I'm unaware of any proof that one or the other is considerably better across the board. Though my gut does tell me that randomization is a lot better in the specific situation of regularly signing in and out of accounts.