Here are my ride comparisons for DL and WDW:
Magic Kingdom
Big Thunder- Longer at WDW; didn't seem as fast, broke down while we were on it for 5 seconds lol, so that made it feel like DL hahaha
Splash Mountain: It was under refurb. It was also very cold, so I doubt we would've rode it anyway. But the seats are side by side; You get wet, but i don't think it's "drench mountain" like the DL version lol
Space Mountain: The seats are set up like the Matterhorn. I thought it was faster and had more dips, but I didn't like the music.
Haunted Mansion: I honestly didn't like the design of the outside. It has a gothic brick style to it. I prefer the big white mansion we have at DL. Make sure to read the tomb stones though! They will give you a chuckle.
Pirates: Not as cool or long, but make sure to see it yourself.
Barnstormer: WDW's version of Gadget's Go Coaster
Teacups: I liked the one at WDW more because it has a 'roof' over the teacups. We went when it was super cold, so it was nice to take a break for the cold air
Jungle Cruise: We skipped this, but I heard it's longer than DL's version
Winnie the Pooh: Adorable and you must ride it! The queue is cute too!
Peter Pan: i'm not sure how the wait is for it right now, but it was one of the longer ones, just like DL. It seemed pretty much the same. The big difference is that you load on with a conveyor belt. The landing isn't as rough as the DL one either.
Honorable Mention:
Seven Dwarves Mine Train- This ride is awesome!! This will probably be your longest wait in the park. The only ride to compare it to would be Snow White's Scary Adventures, except it's not scary and won't traumatize children lol. The ride is very smooth, no jerkiness, and good for all ages.