It depends what you're looking to get out of it...
Okay, but seriously, it does somewhat depend on you and your preferred play style. First you need to consider which side of the galactic war you want to be on (or if you want to be neutral). Then do you want a very rigid kind of structure, or something a little more relaxed? Do you want a larger, canon group, or a smaller group trying to make its own name? A lot of nationalised factions, or a few?
You can find people who will say good things about any government, just as you can find people who will say something bad about any government. Maybe if people comment more on their experiences with governments, and what aspects they found good or bad, you can get an idea of what might suit you?
____________"May the Grace of Ara go with you, and His Vengeance be wrought upon your enemies."
Only fools and children dream of heroes.