Here's my opinion of the strengths of the two RA2 factions and which IMO faction has the same advantage in BP:
RA2 Soviets:
Armor- UEF (According to the FS wiki, a Solaris has more hp than an Erebus/Raynor and Titan)
Numerical superiority-TIE (The GTVA 'could' bring in more ships than the UEF and it already has more destroyers in-theater, but according to a picture posted in this forum, the UEF currently has a lot more smaller capital ships. I wasn't sure how to call this one)
Raw firepower-UEF (Apocalypse torpedo swarms and good anti-subsystem weapons give them a blunt edge)
Overall higher technology-? (Not sure how to call this one just yet)
Aggresiveness-GTVA (They started official conflict unfortunately)
RA2 Allies:
Mobility-GTVA (Sprint drives really help)
Specialized heavy firepower-GTVA (Beams seem like a scalpel to the UEF's Apocalypse hammer and less logistics needed I'd imagine)
Better on the defense-UEF (They're fighting for their home)