I did this a little while ago...
All five Warner Bros movies, Batman '66, Phantasm, RotJ, Batman Vs Dracula....basically, I find every one to be enjoyable. Yes, I mean every one. The quality of Phantasm really stood out. The Batman Vs Dracula is extremely entertaining. Batman the Movie is delightful and impressive for the sheer consistency of style and tone.
And as for the biggest Batbabe....Lee Meriwether's Catwoman, no question.