>>6064My vote goes to Gundam Assault Survive. Battle Universe is good, too, but while it has atmospheric effects like rain and fog it doesn't have Flags or Freedom.
GAS cut a bunch of supporting-character and side-story pilots to make room for the SEED and 00 eras, but the only MS cut were the abstract GM and Saku.
The next version, Gundam SEED Battle Destiny for Vita has better graphics but is SEED and Destiny only and really assed up the flight controls.