Benefit of separating services into individual servers?

[feelingsonice]

I'm currently multiplexing different gRPC services under the same server (e.g. Server::builder().add_service(foo).add_service(bar)), but I came across the load balancing example and I'm now wondering if it's more beneficial to create a separate server per gRPC service? Assuming a single machine, I'm guessing there's no different here except that it's using multiple ports?