I voted for Space Mountain, as I have yet to try Dinosaur or Primeval Whirl (the result of very fickle friends not wanting to wait). I thought it banged me around a ton. I'm very very skinny, tall, and lanky and I have lots of sharp bone points, and this was definitely not enjoyable, although I had a great time on the ride. RnR doesn't jerk me around at all, however I think I hold down the chest protector thing wayyy too hard - last time I came out with shoulders and ribs covered in black and blue marks! I was absolutely horrified until I remembered how tightly I held on and realized that must have done it!