On both Good and Dark path you side with the "evil guys" and there is corruption either way but depending on your choices it plays out very differently, so yeah you can say F U to the BBEG.
Good Paths are geared towards relationships, love interests, and harem building. Overall, the scenes are sweeter and more romantic for players. If you're looking for a more happy playthrough/experience, or just want to knock everyone up (eventually), maybe even get married? Stick to the Good Paths.
Dark Paths are more extreme, in every sense of the word. You can expect to see things like NTR(optional Dark Path), mind break, gangbangs, dom/sub relationships, and a bunch of other fetishes that are overall less female-friendly/romantic and not really for the faint-hearted.
Cheers. The Grace one had a small issue.
The Stacy one is a journal glitch caused by the revamp. Damn, those are pretty dumb ones.
Anyway fixed and that should be the last of it.
Currently re-uploading the game. Sorry. Luckily it's only been up for a few hours.