I think a lot of us are talking about different things, which makes sense because "service" is an amorphous phrase. My experience hasn't been that employees at either resort are rude, far from it. But the operations that rely on employees, whether they be in restaurants, at attractions or in stores, run much better (in my opinion) at Walt Disney World than at Universal Orlando.
I certainly don't blame employees for their poor training nor culture. But employees not communicating with guests when things go wrong or not knowing when a show is happening or where a bathroom is located has been a consistent part of my trips to Universal Orlando over the past 10 years. I still think it's mostly fine, but the resort charges Disney dollars and in many other ways provides a comparable, if not better, experience. The resort as a whole has work to do in this regard, in my opinion.