Generally speaking, maintenance at DLR is better. But WDW has far more AA's, so they also have more AA experts on staff who can fix things. I remember reading many years ago during DL's POTC Jack Sparrow redo, they had to 'import' a bunch of AA folks from WDW to get the work done, since there wasn't anybody with the knowledge on the west coast
As far as "signature" AA's (high-quality figures that aren't on both coasts), DL really only has Lincoln, while WDW has the Wicked Witch, SiR (or whatever he's called now), Stitch, Will Rogers, and Benjamin Franklin, plus a whole slew of 'supporting cast' that DLR's never had. To me, DL is known for having tons of rides in a very small space, while WDW (especially MK) is known for its AA extravaganzas
But as always, it depends which exact moment you're talking about, since things can look particularly good or bad depending on specific effects that may not be working