Radio waves in a vacuum travel at c. They move more slowly in things like copper. Light in fiber cables travel at about 2/3 c so a neutrino beam would be fast

Radio waves in a vacuum travel at c. They move more slowly in things like copper. Light in fiber cables travel at about 2/3 c so a neutrino beam would be faster and potentially have a shorter distance by going through the earth. Actually designing and implementing a communications system using neutrinos is an exercise left to the reader.