This is tough one as neither do all that much for me. I'm going with Lea in the '80s. Current day I guess I would go with Shue since I have no idea what Lea even looks like now.
Shue did nothing for me in Karate Kid - average. However, she had largely fallen off the map (at least to me) and then out of nowhere I saw her in The Saint where she was smoking hot and I guess Leaving Las Vegas as well. I think that was her hot window were those two movies.
Everything I've seen her in the last couple of years doesn't do much for me again.