Man, that's a tough one. There have been so many phenomenal fighters in the history of the UFC. If I have to pick the top three UFC fighters ever, here are my choices:

1. Anderson Silva: This guy maintained his reign for a long time, finishing dudes left and right and didn't just win, he dominated. One of the most skilled strikers in the history of mixed martial arts.

2. George St. Pierre (GSP): I mean come on, GSP dominated his division for years and he wasn't just a great fighter, he was a great ambassador for the sport.

3. Jon Jones: Controversial, I know, but if we're talking skills inside the Octagon, there's no doubt that Jon Jones is one of the best, if not the best. He’s maybe the best martial artist of all time.

Look, this is subjective though. There are so many legends like B.J Penn or Matt Hughes who've have left an indelible mark on this sport. And let's not forget the future looks bright too with guys like Khabib Nurmagomedov showing extraordinary talent. Always evolving, always changing, that's the beauty of this game.