I would say space mountain at Disneyland, mostly because of it's awesome soundtrack that Disneyworld's does not have.
I have to got with Space Mountain, from earth to the moon at Disneyland Paris, It is just the best of all them. any questions? ha!
I agree, Pistian. It's simply amazing, and I was smitten from the moment we were sitting in the barrel of the cannon, waiting to be shot!
Disney World's Space Mountain is one of my favorite rides at WDW.
