Julie Newmar. Tall T&A and goodlooks. I find them all good & sexy, to be fair, and they all have impressive bustlines, sexy legs, and each brought an impressive bootie to the table.
I give Julie the edge for her height, and because she was the first tv Catwoman. :-)
I agree, it IS a tough choice. It is like trying to determine which of Captain Kirk's babes was the best.