If you really think about, Universal is really expanding/investing more rather than Disney where it's more of a remove an replace sort of thing. Universal has Fallon, F&F, Volcano, Hotels, Nintendo, SLOP, 3rd/4th Park, Wet n Wild plot. Disney has Star Wars, Toy Story, Avatar, GotG.
And something kind of interesting is that Disney really enjoys doing a one hit type of expansion where they spend 1 Bil within 5 years and then forget about that park for 10 years. Where Universal likes to expand their parks every year.