We're in agreement that gravity waves and neutrinos are harder to produce and detect. They are better for long interstellar distance communications because the

We're in agreement that gravity waves and neutrinos are harder to produce and detect. They are better for long interstellar distance communications because their weakly interacting nature and difficult to produce nature means there is no dispersion relationship to worry about, no absorbtion/attenuation issues to worry about, and no noise sources to worry about. The galaxy is a surprisingly difficult medium to send radio waves through if you want them to be received at great distances (difficult medium, not impossible medium). That's one of the things that led early SETI thinkers like Barney Oliver to propose using the spectral Water Hole[0] as a search target. Gravity waves and neutrinos are harder to produce and detect but the galaxy itself is much less likely to interfere with their propagation if you can produce and detect them. Also, communications uses of gravity waves would presumably be at much higher frequencies so the detector sizes would be much smaller (the size of an interferometer or Weber bar detector is a function of the center detection frequency of the device... sensitivity is largely independent of the size, other than the choice of center detection frequency). [0] https://en.wikipedia.org/wiki/Water_hole_(radio) https://en.wikipedia.org/wiki/Water_hole_(radio)