Disneyland Paris has the BEST version of Space Mountain! Yes, it has inversions. It also has side-by-side seating similar to DLR in CA (wider track = smoother ride!), great music and sound effects, and AMAZING visual effects (to include a SUPER NOVA!).
Phantom Manor is a unique version of Haunted Mansion. Be advised, it has a lot more "scary" decaying skeletons, etc. especially at the end. Of note, it's located in Frontierland and has a western theme at the end. This is because the backstory of Phantom Manor is actually related to Big Thunder Mountain Railroad (it also borrows heavily from the "bride" storyline). Be sure to look up the backstory online ahead of time. It will make Phantom Manor much more interesting.
Big Thunder Mountain is the most popular ride at DLP (judging by the lines). They do offer "you know what" which we always used in order to avoid those long lines, but they run out early. It's very similar to WDW version, but one unique feature is that it's out on an island in the "river." The ride vehicle travels under the water through tunnels to get there and back.
Crush's Coaster in the studio park is great! Be warned it spins! The motion could be an issue for some, but it does a great job of simulating "swirling" around in the EAC. The ride is indoors, with bubble projections, etc. adding to the effect. Before the lift, there are also appearances by several Nemo characters.
The "Armegeddon Special Effects Show" at the studio is pretty cool. Be advised you stand the entire time. Essentially you are in a set of the space station and then meteors start hitting the station and chaos ensues. Loud noises, explosions, and jarring motion could be an issue for some.
Pirates of the Carribean is closer to the version at DLR (although they have the skeletons at the end... which kind of makes sense with the story).
The entire complex is much more like DLR in that you enter through security into a large courtyard area with both parks right next to each other (as well as Disney Village shopping and dining complex). To park hop you just exit one park, walk across the courtyard and head into the other. Very convenient!
Do not miss the dragon under the castle!
And Disney Dreams is a great nighttime spectacular... think Wishes fireworks + Magic, Memories, & You-style projections on the castle + Fantasmic/WOC fountains and projections on water "screens." Amazing show!