Personally I think the one thing that really separates WDW and Universal is the food. The food is awful there for the most part. There are some places that do it well (Mythos) but across the board it's just pretty gross IMO. If I go to Uni, I actively figure out if I am eating before or after whereas going to Disney I have no issues eating anywhere (Although admittedly Epcot and AK are much better than MK and HS). Disney Springs vs Citywalk is a no brainer. Nothing at Citywalk is worth eating, maybe Red Oven for the value is an OK choice but with all the excellent food options a short drive away I'm gone.
I know some other culinary executive got poached by Universal who worked heavily with F&W but even with UOs recent scaling of festival type food kiosks it was still disgusting (mardi gras, HHN, etc)
Surprisingly I remember the food at Volcano Bay being OK but yeah UO is great for many things, but food is really the biggest thing holding them back. I'd be curious to see if this addition changes much.