Epcot pulls a lot more weight than you'd think because of the various walkthroughs and galleries in World Showcase. Animal Kingdom gets a boost from the trails, too. Surprisingly, those numbers don't include the shows, which are almost completely powering DHS right now, and which would be more worthy of the term 'attraction' to me than things like the Bakery Tour at DCA and the American Heritage Gallery at Epcot. I'll have to sit down one day and make the count using my parameters.
When you limit the number to rides, DL currently leads the pack, with 51 to WDW's 47. After the summer, though, they'll be dead even, as WDW will gain two and DL will lose four, gain two back (Bugs Land and Pixar Pier). Then, in 2019, WDW inches ahead, gaining Mickey alongside Galaxy's Edge.