gRPC is a pain in the ass to setup. I strongly disliked the web client library for it.

I don't like REST because it's basically become a specific url structure with semantic http methods (e.g. POST for create). Practically nobody bothers with the HATEOS stuff. Things start breaking down if you have a complex resource hierarchy and custom methods.

I've personally just settled on rpc using json. Any consumer of the api REST or otherwise is going to check the docs for the correct endpoint, at which point there's little to no difference between rpc and rest.