I think you'll find the pool area usually overtaken by kids on most cruises. There is an adult pool, but that's overrun by adults. The nice thing about the Freedom class ships is the H2O Zone, which is like a water park for kids. That leaves more pool area for us adults.
I've been on the Jewel and the Mariner more than once. I loved sailing on both. In my opinion, the ice skating rink and Promenade deck on the Voyager class ships, make that class my favorite. If a person never sailed on either, then it really won't make a difference. I would recommend sailing on both sometime in you life.