Actually, Universal has an indoor rollercoaster, dark rides, a motion simulator, shows and 3D experiences. What do you know? MUCH like Hollywood Studios!
So I guess that would make Hollywood Studios much like what you'd find at Six Flags too?
take a pill.
idk that either can be compared to Six Flags, but i've never been to Six Flags or Universal, so.
MGM/DHS is my favorite park. it encompasses the Hollywood of the 40's and 50's... it features an indoor rollercoaster themed around the awesome rock band, Aerosmith, a "free fall" elevator ride [Tower of Terror], a "Great Movie Ride" which highlights some of the classic films from way back when, a Star Wars area complete with motion simulator ride and Jedi Training Camp. This summer it will open up Toy Story Mania, a 4D "Space Ranger Spin" sort of ride that looks fantastic. The Animation Station is there, as well. DHS also has great stage/stunt shows - Beauty and the Beast, The Little Mermaid, Indiana Jones!!!, Lights, Motor, Action, Playhouse Disney, and the fireworks phenom Fantasmic! There's also the 3D Muppets movie, not to mention fabulously themed eateries like 50's Prime Time Cafe, Mama Melrose's, Sci-Fi Dine In, and The Brown Derby. And even with that description, I'm sure I missed a lot!
Also, it should definitely be mentioned --- the Streetmosphere is incredible at DHS. the little side shows are hilarious, and it's really unlike stuff you would find at Universal. i wouldn't necessarily say that you should go to DHS if you're looking solely for adventurous rides. at the moment, it's rather lacking in that department. but i would definitely recommend going for the atmosphere, if nothing else.
again, though, i've never been to Universal.