I greatly prefer SD SW over Orlando. While the shows are similar the overall feel of the park was so much better at SD. Sea World San Diego is the only Sea World on the ocean. One side of the park runs along Mission Bay. You get the ocean atmosphere that to me enhances the park experience.
At Orlando the stadiums were all covered. At San Diego they are all open air which I prefer. I suppose Orlando must be covered because of considerable rain or intense heat in the summer months. The Pets Rule show in Orlando is completely indoors while San Diego's version is outdoors.
The Pacific Ocean and its beaches are only about 1 mile from SW SD. We like to spend one full day at SW, then the beach for part of a day and return to SW for night time. Also the San Diego Zoo, USS Enterprise tours and many other fun things around the area make for a great visit.