I prefer Disneyland's. Our Splash Mountain is the only one that has the single-file rider style. And so, it makes Disneyland's a little more unique than from Walt Disney World's and Tokyo's Splash Mountain.
I think DL and WDW style are both good. They seem to give out a different sense of riding... if you know what I mean. Like DL's feel more like its for you- it feels more private. WDW's feels more luxurious but you lose a certain feeling. It's kind of hard to explain, I hope someone understand what I'm trying to say though.
And yes, WDW's seems to be higher capacity...
"You're not thinking fourth dimensionally!" -Back to the Future
"With this place, I wanted to give them something real, something that wasn't an illusion, something they could see and touch. An aim devoid of merit."
I voted for Disneyland's because I believe the single seat only option instead of the two-seating arrangement they have at WDW allows you to see everything that is going around you without human heads interfering.