I don't really have a vote here. Somehow, none of the female leads of TOS did much for me. Which is odd, since I grew up watching the show, so you'd think it would've shaped my standards of attractiveness. Maybe the timing was wrong. There were certainly plenty of guest stars I found stunning, but the regulars didn't appeal to me much.
I know what you mean. Truth be told, Emma Peel and Catwoman (Julie Newmar, of course) made a much bigger impression on me back in the day!