Busch Gardens is actually a very good park with lots for kids to do, see and experience. It's a park for everyone imo, even with all of the coasters. They have a ton of animal exhibits, shows, Sesame Street Safari of Fun, the new Madagascar show, and other areas with rides for smaller kids (Timbuktu). There's also their Christmas Town holiday event, which is explicitly marketed towards families and is a GREAT addition to their lineup. I won't say the same for Sea World because the park just doesn't interest me and neither do their shows. Manta and Kraken are great, but that's where the fun ends for me. I'm not an animal show person, which is why I enjoy BGT's shows much more.
BGT is doing a great job with everything they do of late. I can't say the same for Sea World.