It’s an older crowd on Jewel with entertainment targeted accordingly - just a nightly theatre show, a small cinema and the standard live musicians. No dedicated comedy club.
Far fewer casual eateries than on Carnival - there’s no equivalent to Guy’s burgers, Blue Iguana, the BBQ place or the pasta bar, although I think Royal’s buffets are better.
If you like smaller, older, more traditional ships you’ll be fine but if you prefer bigger ships with lots going on you may find Jewel a bit dull and old-fashioned.