Which is scarier of the 2 rides, Matterhorn bobsled at Disneyland Anaheim CA or Space mountain?

I've been on matterhorn just fine and i had a lot of fun on it. But my girlfriend wants me to go on space mountain and i don't really like the concept of the darkness and not knowing the next turn ahead. I've also been on Indiana Jones and that was a blast as well. So is space mountain faster of these 2? And is there anything i should worry about in space mountain? Is the ride longer then matterhorn and Indiana jones?