The biggest fights in MMA history were held in PrideFC. There has yet to be a fight bigger than Fedor/Cro Cop imo.
The biggest fight in UFC history is probably Lesnar/Carwin or something else that is lulz-worthy. Tito/Chuck maybe.
The best fight in UFC history is Tito/Frank imo.
"Obey the principles without being bound by them.” --Bruce Lee
"Boxing is like jazz. The better it is, the less people appreciate it." --George Foreman
XBL Gamertag: Dr Atheist