Re: Your favourite duel from Episode I-VI.
 

The only thing I can think of is Obi-Wan's preferred lightsaber form is defensive, Grievous is clearly an aggresive character and duelist, perhaps why he was able to hold off Mace Windu.

Obi-Wan was one of the people who hought that the best form of attack is defence. Looks like it worked in this case.

Re: Your favourite duel from Episode I-VI.
 

i suppose I should vote...

oh decision between yoda vs dooko and Windo vs sidious

Re: Your favourite duel from Episode I-VI.
 

Obi Wan vs Darth Vader (Episode III) without a doubt. It's pretty THE fight of the entire series, the one everyone was waiting for for years. It's an intense scene that defines the entire rest of the series, and is the culmination of 12 years of development for Anakin and his relationship with Obi Wan. The scenery is also incredible.

Re: Your favourite duel from Episode I-VI.
 

Actually, come to think of it, it WAS the only fight scene I was close to tears at (But then again I was really sad when Qui-Gon died)