ESB...easy. I'm a fan of "movies"..I always thought ANH was great, but sketchy at parts. The addition of a director who focused on characters, and a script which focused on the character..made..well..the "second act" of SW the best as a film. Highly entertaining, with the effects looking far more superb than the ANH (well, when filming upon a white background- snow- they have to be!).
As for TPM..ok..it's enjoyable, I actually like the look back into the history and the whole Naboo deal. However I like the movie posters better..where the little kid has a Darth Vader shadow. How cool
