Personally I think you get more for what you pay for from Walt Disney World (WDW), rather then Universal Studios(US). Both cost $67 for one adult one day on park ticket, but at WDW you know you'll have the "magical" experience, and have people be more then willing to help you when help is needed, rather then US where you get an attitude when you ask a simple question as "Where is the closest restroom?". WDW also has things for the whole family to enjoy from Playhouse Disney (at Disney's MGM Studios) to eight clubs for nightlife entertainment at Pleasure Island (as of 1.1.07 the changed it so that you need to be 21+ to enter the clubs). Not only that but you could see everything at US in a day (two days if it's busy), but you could spend a week at WDW and not see half of what they have to offer.
Once again this is my opinion and your choice, so which ever you go with I hope you have fun!
P.S. If you decide you want the rides and not the shows/experience, I suggest trying to go to Busch Gardens in Tampa, FL.
Lived in Orlando for 7+ yrs
Had US annual Pass
WDW Cast Member