Mary Ann, but that's because I always go more for the 'girl next door.'
I've even seen a similar type question raised about Jan Smithers and Loni Anderson from WKRP in Cincinnati. Smithers, the 'girl next door' often does well, like Mary Ann.
oh and DEFINITELY Mary Ann!!
For instance, whenever I see Snapchat or Instagram filters that alter a picture of someone's face, it reminds me of the Clock King episode where Batman manually drew a mustache on a picture of Clock King to match his face with Progress Pigment. This also foreshadowed what is now facial recognition technology.
And whenever I see Batman consulting maps in the Batcave, modern day Google Maps come to mind.
I don't know where DNA testing technology was in the 60's, but Batman determining so much information about Catwoman's henchman from a strand of hair would not be unusual today; even if the information gathered would be different.
And whenever I use the voice activation feature to ask a question to my phone, I think of Batman.