There are indications that Terrans are higher in number though; for example, in FS1 they said that 4 billion died on Vasuda Prime, which seems a rather small number considering that the most of the planetary surface was razed and there was no time for any mass evacuation. I think if the same had happened to Earth, the death toll would have been much higher especially with the increased population by that time.
I think the really major systems and centers of population are Delta Serpentis (terran), Beta Aquilae (both), Antares (terran), Vega (both), Vasuda (vasudan) and Alpha Centauri (vasudan). The NTF systems (Polaris, Regulus, Sirius) are obviously predominantly Terran.