New forum, obvious new question! 
1. SITH
2. EMPIRE
3. NEW HOPE
4. CLONES
5. JEDI
6. MENACE
These are all pretty close for me though. I'm a Prequel Lover. TPM has its flaws but it also has the Podrace and the Duel of the Fates and the first appearance of proper Jedi so it will always hold a special place in my heart.
ROTS is the topper for me for the sheer amount of content in it. So much is crammed into those two hours, and while Anakin's Fall isn't the greatest bit of writing, we get to see a war on a dozen different planets, the Battle of Coruscant is so much fun, it's the most screen time Palpatine ever has, I absolutely love Grevious, Obi-Wan vs. Anakin, and my personal favorite Yoda vs. Sidious.

1. SITH
2. EMPIRE
3. NEW HOPE
4. CLONES
5. JEDI
6. MENACE
These are all pretty close for me though. I'm a Prequel Lover. TPM has its flaws but it also has the Podrace and the Duel of the Fates and the first appearance of proper Jedi so it will always hold a special place in my heart.
ROTS is the topper for me for the sheer amount of content in it. So much is crammed into those two hours, and while Anakin's Fall isn't the greatest bit of writing, we get to see a war on a dozen different planets, the Battle of Coruscant is so much fun, it's the most screen time Palpatine ever has, I absolutely love Grevious, Obi-Wan vs. Anakin, and my personal favorite Yoda vs. Sidious.