Supabase. Pros: affordable, production ready, and seems relatively quick to get up and running. Cons: Some have mentioned security concerns around how they handle auth, and potential complexity around having lots of application logic at the DB level
Nhost: Seems like a really great Supabase alternative, strong focus on graphQL. Con: they are new with a very small team which always concerns me in the case they need to suddenly shut down in the future
Xano. Pros: Probably the quickest to get up and running and delivering JSON to the frontend. Cons: full "no code" solution as opposed to "low code". They do advertise as being turing-complete and able to do anything code can do, but full no-code always gives me pause for a production application passed an MVP