It might've been the YouTube sparring between Bill and Carrie Fisher (back in 2011, I think). Pretty funny videos, actually. The condensed version: Shatner opined that SW was mostly a kiddie show, while ST was more adult sci-fi. Bill also mentioned that the Trek women were better-looking.
“...Bill also mentioned that the Trek women were better-looking. ...”
Yeah.....but remember, he “did” the green broad in that one episode, so his eye for beauty might be a tad off...