If I'm not mistaken, I think the defining feature of the cheshire cat in Alice in Wonderland is the huge smile, so I'd say Tabby for that reason! But my first thought was Bob since he's a purple cat, so he'd be great too, of course.
If you mixed Moe's eyes with Tabby's smile, it'd be perfect.
But I would say Moe, his smile is suspicious enough, and those eyes are absolutely perfect!