Well Unverisal caught on fire so that may impact your decision.
The Back to the Future clock tower was destroyed, and so was the king kong ride.
Unverisal is more about the rides. If you want to see a real movie set. Do the Warner Brothers VIP tour it's a small tour of a working movie studio. No rides so your kids may or may not like it. My 8 year old nephew loved it but he is a movie freak like me. He loved seeing the batmobile.
Also if you are around Burbank at night you may be able to see the taping of a TV if they are in production. If the show is popular get there about 2 hours ahead. Because a ticket doesn't gty admission. The TV show taping are free. We saw "Big Bang Theory" it's fun to see "your" espiode on TV. http://www.tvtickets.com/
I have been to Los Angeles a lot so any questions you have just ask.