I'd definitely go with the Larry Holmes fight. Yes Holmes was somewhat past his best but it was an exceptional finish considering how good Larry's chin was. Brutal and brilliant, it was Tyson's best performance.
I voted for Biggs but I also like the Pinklon Thomas fight. The ending like with most Tyson fights was spectacular. There was booing momentarily then Tyson gets in an uppercut, then the leaping left hook. Then it was all over.