Now really analyzing both Osaka and Hollywood's queues...
Osaka does a much better job at world building and explaining the premise of the ride, while Hollywood is the better queue in terms of visuals and variety.
Like, I know most guests are not going to give a single damn, but the Hollywood queue is way more haphazard than Osaka. In Osaka, the queue starts directly at Bowser's castle, which makes sense since as the premise is that Mario & friends have been challenged by Bowser for a "fair" race. In Hollywood, you start with Yoshi...
What does this contribute to the plot of the attraction? Yes, it looks really cute, it feels me with nostalgia, but what does it have to do with the big race? I know most of you dont care, but these little things matter to me. Because after going through the Yoshi area, we're all of a sudden at the front gates of Bowser's Castle. Huh?
Once you get pass the Bowser statue in Osaka, youre taken down a long hallway. This area does feel like dead space in comparison to the Hollywood version, but it does a better job at explaining what's actually going on here. The Mario Kart trophies are proudly displayed on a platform, and adjecent to that is the Universal Cup displayed, alongside Bowser's letter to Mario. Since you're always going to be walking through this hallway, you'll never miss this detail.
While in the Hollywood version, the Universal cup is haphazardly placed on a random brick block, while the actual set-up information is tucked away in another corner of Bowser's Foray.
Then there's Osaka's...uhh..."Advertising" room(?) This area is that big "dead" space i mentioned in the post I made the other day. I didn't really think this area mattered much, but on futher inspection, its not as pointless as it seems. This area shows how the media press is preparing for the big race (hence the MKTV van and the kart parts all over the place). It also displays information about Mario enemies on display panels, more advertising for the big race and portraits of the race participants.
This room is then juxtaposed by Bowser's Foray in the Osaka version (in which we immediately jump to in the Hollywood version, as the "Advertising" room has been completely omitted). This shows how Bowser is actually rigging the race, and plans to completely sabotage team Mario.
The thing is, I don't know if that point fully comes across in the Hollywood version, as a bunch of information is crammed into Bowser's foray.
TLDR: Hollywood is more visuslly concise, but Osaka has better pacing and consistency. The plot in Hollywood is the same, but the way its delivered is inferior, making the already chaotic ride experience even more confusing from a roleplaying standpoint. Osaka guides the guests into the narrative better than Hollywood (the preshow still sucks in both though. They reeeaaaaallly should have had the characters interact before the big race. We the players know that Bowser has rigged the race, but Team Mario doesn't).
Anyway, 98% guests wont care about the setup so eh.