Sins of the Sires doesn’t have any unequivocally “good” endings, but it certainly has some “better” ones. It also has very, very many different ones, so I’m not sure why you’d be getting basically the same ending if you made different choices.
I know it does, but I can’t seem to kill the final boss. I have gotten another ending where I ran off with the vampire girl. Is there even a way to kill him?
It’s definitely possible to defeat Kapriel. Heck, you can even diablerize him (yum!). But the easiest way to not be captured by him is to have Celerity as one of your Disciplines and, when he catches up with you in Belgrade, run.
I would really love for you to end the werewolves:haven rising in a good way like the main character been the most powerful and strongest wolf in the pack, remember you haven’t make him the leader yet