gRPC fits a synchronous request-response model well but can also work in conjunction with reactive extensions. It’s high on my list whenever I’m in situations where I have a good deal of control over both the client and server ends of the spectrum. If you’re having to support a wide variety of other applications that might need to talk to your microservices, the need to compile client-side code against a server-side schema can be problematic. In that case, some form of REST over HTTP API would likely be a better fit.
