Hey @User!
We don't have any solid numbers backing up performance superiority yet.
However, I believe gRPC though not widely adopted, should outperform HTTP. Mainly due to tight packing of the Protocol Buffers and the use of HTTP/2 by gRPC.
SigNoz is an open-source APM. It helps developers monitor their applications & troubleshoot problems, an open-source alternative to DataDog, NewRelic, etc.