I know you asked about rides, but food is a big deal to me so I have to go with EPCOT. They have something for everyone, and the seasonal festivals make it so there's always something new to see.
I always tell people that if you're a Star Wars fan or you're big on entertainment and shows, go to Hollywood Studios.
If you're a foodie, go to EPCOT.
It's hard to compare rides. Hollywood Studios has more options for more thrilling rides, but now EPCOT has Cosmic Rewind which I personally think is one of Disney's best roller coasters.