[alexdeloy]

I was asking myself the same thing and apparently protobuf has no concept of "null", thus I can see how MessagePack might have an advantage depending on your use case here.

https://github.com/neuecc/MessagePack-CSharp#comparison-with...

[fizx]

protobuf can do nullable values, but you have to ask for them as primitives are the default. e.g. StringValue (nullable) vs string (not)