Who do you guys think has had the biggest feud of all time in MMA? 
Chutebox vs. Hammer House
Chuck tito?
Gracie penn?
Gracie saku? 
Tito vs. Lions Den
Josh Barnett vs steroid tests
Tank Abbott vs Art Davies
Keith Hackney's fists vs Joe Son's balls
Brett Rogers vs his wife
Chael Sonnen vs the truth
Dunno about biggest, but Wandy/Page, Brock/Mir and Fedor/CroCop are some of my favourites.
Rampage vs Wand.
but Chael vs Anderson is surapassing that,
The rematch is gonna be epic... If Chael wins the second fight, the rubber match will be even bigger than that.
Tito vs Dana, Ken, Chuck, etc
BTT v/s Chutebox
Luta Livra v. Jiu Jitsu
Tito v. Lion's Den
Tito vs Lions Den
and he ran through them
MMALOGIC - Rampage vs Wand.
but Chael vs Anderson is surapassing that,
The rematch is gonna be epic... If Chael wins the second fight, the rubber match will be even bigger than that.
There is no "Chael vs Anderson" feud. Its Chael vs his relevance.
Chuck / Tito. And as far as in ring goes I rink franky and gray are getting close
Pele vs Macaco or Tito vs Ken
Tito vs lions den hands down
SnapLocally - Josh Barnett vs steroid tests
Tank Abbott vs Art Davies
Keith Hackney's fists vs Joe Son's balls
Brett Rogers vs his wife
Chael Sonnen vs the truth
LOL
Ken vs Don frye
Jeff Monson vs The world
Diaz-Noons
SnapLocally - Josh Barnett vs steroid tests
Tank Abbott vs Art Davies
Keith Hackney's fists vs Joe Son's balls
Brett Rogers vs his wife
Chael Sonnen vs the truth
Bravo!