We are now long time Universal fanatics, so I am biased and I know it.
I took our kids on a full immersion Disney vacation when they were the ages being discussed, along with all the planning, ADRs, FastPasses, etc. We had a GREAT time, no lie. There were plenty of things we did not like, and a few surprises that we did like. For instance, my kids bawled at A Bug's Life, it completely freaked them out, but loved Tower of Terror (yes, we are the parents that took a 3 year old on it, and she begged for more!). So many memories, and there is no equivalent to the princesses for my daughter.
Then we went to Universal, and our theme park lives changed. No exaggeration. We still go to Disney for Christmas Party or Halloween, or just a day at Magic Kingdom to eat at the castle. But, the whole Universal experience was just superior for us. All based on Express Passes and the hotels. To be honest, if Disney had an equivalent, my family might still be at Toy Story Mania. But...they don't and that is a fact.
My kids are adrenaline junkies, so as much as the still like the Disney IPs, there's not enough for them. Also, Express Pass spoiled them. They aren't interested in using up 3 Fast Passes, then waiting in line for the rest of the park. Heck, we had to cancel our Cedar Point annual passes, because now they won't go without FastLane, it's Express Pass equivalent and $90 bucks more per day per ticket...
So for us, it's not about lining up ride to ride comparisons, or the amount of rides, or even the type of rides. It's all about the flow of a vacation. They are picky eaters, but more so, they are spur of the moment eaters, they are not flexible, so trying to decide where to eat 6 months out is an issue for us. They don't want to wait in line standing, although we are fine with walking. They love the Universal IPs, but even if they didn't, I think the overall experience is more for us.
I have a niece who is a
Disney travel agent, so I get the draw for those families, and if they ever adopt the equivalent of Express Pass, no matter the price - Unlimited FastPass if you stay Deluxe, I might even buy into DVC if it came with Unlimited FP - I will budget and save until I can afford. They won't, so I don't...