Henderson's strategy will be: leg kicks, leg kicks, TDs.
Diaz has a history of having problems against bigger, stronger guys, who have a good wrestling game: Rory, Kim, Guida, Maynard.
Henderson falls in the same cathegory.
I give Diaz the advantage in the striking department...but at the end of the day he is no Frankie Edgar, even though his boxing is top notch, he doesn't have the speed that Frankie has, and that was what caused Henderson a lot of problems in his fight against Frankie.
If Henderson is smart, he will take it to the ground and try to use heavy GnP, similar to Rory.
Either way, should be a good fight.
My money is on Henderson.