Both gave me boners...
As far as rankings, I know I'm slightly off of everyone but...
1) A New Hope - This started the Universe. Nothing else exist without this gem.
2) Empire - Better story, starts painting the picture of the galaxy and really sets up the viewer for the next 30 years of addiction
3) ROTS - Aside from the way overused CGI and overall horrible acting, the score is arguably the best of the franchise...just amazing. Final battle was beautiful, despite the ridiculous CGI used.
4) ROTJ - I was 3 when it came out...loved the ewoks. As I got older, I found the path to the darkside and now all ewoks must die...still better than JarJar though. Also, Saarlac pit and entire barge scene is just great.
5) Phantom Menace - The beginning of jumping the shark for Lucas imo. The last SW taste we had was ewoks taking down the galactic empire with a bunch of teenagers...So next why not give us JarJar and the gungans?...Story could have been fantastic and an opportunity wasted. Maul could have been so much more too.
6) Clones - I actually stood up in the theater and said "F You George Lucas" during this movie. 3 hrs of trade negotiations...what a swell idea for a movie.
As far as the new movies, I'm torn on how I feel about Force Awakens. I wanted to love it, I really did...but Betty Sue Rey and Emo Sith killed it for me. It was very un Star Wars like in the way it was presented, which I expected from Abrams, while still pretty much copying ANH as a story.