Benitez has indeed had less to work with. But in all honesty, if the balls were not falling for them and Pool did not have so much luck, they probably wouldn't have been in the Champions League Final this season and certainly not have won it back in 2005. Pool went through past Mourinho and company to reach the final due to a goal that, in my opinion and many others, did not have enough evidence to stand. I also thought Chelsea had played better during those two utterly boring, dreadful matches back in 2005, but the luck went to Pool. Now this season Benitez and company were rather lucky in some areas as well, but honestly you can never count out Liverpool and the Kop in big matches such as that, so they also have that going for them.
But my point is... if Benitez didn't win that Champions League final in 2005 there would be no contest between the two managers, especially when looking at their levels of performance in the Premier League. And as we all know, it's more fair to judge a team within a league than just using head to head matchups.
By the way, Liverpool had arguably the best central midfield in the world this year along with Milan.
Benitez would never come here, but Mourinho possibly could in the future. I think that guy has a little more ambition.