To me, the more "quaint" feel of Universal vs. the expansive WDW is nicer for a "theme park-centric" vacation.
When staying on property at WDW...if you're visiting all 4 parks and solely using Disney transportation, it's not convenient. If I'm at the Poly and want to go to Animal Kingdom, it's not exactly a short trip.
From waiting for a bus to arrive, to the actual drive time, there is a reason Disney tells you to leave an hour of travel time to get to your ADR. Skyliner does help immensely for those resorts/parks that can utilize it.
Universal seems like it's all right there no matter which resort you stay in (maybe less so with Endless Summer).
I will definitely admit that when you enter the gates of WDW, it does feel like you're in a different place and you're not just at a resort filled with theme parks and hotels.
While I'm at it...driving to Magic Kingdom could be the worst of them all. It could take an hour to get through the gates after you park!