My wife and I both love Universal and Disney, but what you're asking is very subjective. You may enjoy Universals show ten times more and that's fine and for you to decide. However the only real way to measure or compare them is guest reaction and whether these shows actually attract more guests or keep them in the park longer. I don't believe Universal really puts in as much effort with their shows, or doesn't have the knowledge to do so personally. Again it's very subjective but I've never really seen anyone talk about a Universal show like it's an event in itself or seen them wait in a good viewing spot way in advance (perhaps they do, I've never heard or seen that though?)
I do think Universal has the most popular evening ticketed event though in Halloween Horror Nights. That's an event that really brings in the crowds and whilst it costs a fortune to build all those houses etc, they certainly make a healthy return on it. Things like that are probably more measurable as you can clearly look at numbers, rather than going off which has the better night show and saying one is better than another down to your own personal enjoyment of them.