To me, your question is kind of like "Which is better, ice cream with cake or frosting with cake."
Actually, both games have a player, Soviet and Frederic, in the center surrounded by hostile forces, so great choice of premises.
So I am telling you it is a matter of historical preference. Both games are excellent.
If I had to pick, I would buy both. Does that make me seem less than responsible?
RUS is more like ACW in that rail roads exist. Both are in depth. Only Wars in America (BoA2) is similar to the more simplistic AJE.