As much as I like Harry Potter, the total number of movies is irrelevant in the case of Voldemort because the original three Star Wars shall forever be more epic than Potter. Voldemort was also a minor character the first half of the eight movies anyways, didn't even show up in Prisoner of Azkaban if memory serves me correct. While Vader/Anakin was a main character in all six!
Darth Vader didn't blow up Alderaan! Grand Moff Tarkin did -face palms- Whoever made this is not a Star Wars fan. Vader single handedly killed dozens of Jedi and ordered the deaths of countless billions of inhabitants throughout the galaxy. Voldemort can't come close to touching that; not even by a Parsec.
Voldemort didn't kill Robert Pattinson! Wormtail did! Wormtail just stole cool points. Burn...
While I agree that Avada Kedavra is cool, Force Choke has more style behind it. You get to watch your victim die slowly while they can do nothing to resist. It allows for savoring of the moment.
Vader is way cooler!
/end nerd rant