Federation Vs Dominion Vs The Galactic Republic Vs Separatists
It seems like it depended on which side you on
but each is depicted as corrupt on some level...
especially as the series have expanded into television, novels and comics.

Watching Star Trek Deep Space 9 re-runs and it seems like MANY civilizations HATE the Federation and find them oppressive.

And Star Wars the Clone Wars animated series continue to show the mistreatment of the clone soldiers by the Republic and the war destroying many innocent civilizations insisting on remaining neutral.
Many Jedi going to the Dark Side and the Separatists actually treating those who sided with them early VERY fairly...
AND WHICH ONE IN YOUR OPINION WAS MORE POWERFUL???
So can ya'll help me out here???