I've done both, I like the smallest boat I can fit into. I am in a Lynx right now, and I'm a tall fat man with no real sense of balance. (Unless balance is a cheeseburger in each hand) This includes falls up to about 15 feet, above that I have no value to your question, because I am also a chickenshit after about that height.
I am currently reading "The Complete Inflatable Kayaker" by Jeff Bennett. I had already read "The Complete Whitewater Rafter". His books are real easy to understand they cover just about everything, including running waterfalls.
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