On a more serious note, both are excellent places to visit. There's a lot of things to do in terms of sight-seeing and outdoor activity. However, the nightlife in Lucern is pretty poor. Even though it's one of the more richer Cantons, it's a fairly residential area. Zurich is probably the best place to go out if you're looking for nightlife.
However, if you really want to experience the Swiss life, then you will need to visit 'Les Grisons.' It's very traditional, and even though it's one of the poorer Cantons, it's beautiful.