Oh, the Expressionists do pretty well in my opinion. I recently bought a pack of them (of course, use coupon for sure!). I was playing with them. Yeah, a little bit of crumb (not a lot), but no problem. I just press any crumb into the paper like I do with every other OP.
I never used the juniors, but they are a smaller price. However, the Expressionists are bigger sticks. But I would suggest trying a pack of the junior or expressionists, and play around. They do make good ketching tools in my opinion.
I like to sketch with OP.