I've been reading the Chebyshev filters chapter in The Scientist and Engineer's Guide to Digital Signal Processing and it says
"The Chebyshev filters discussed in this chapter are called type 1 filters, meaning that the ripple is only allowed in the passband. In comparison, type 2 Chebyshev filters have ripple only in the stopband. Type 2 filters are seldom used, and we won't discuss them. "
Why is it that Type 2 filters are uncommon? It seems to me that it's much more useful to have the ripple in the stopband (the bit you don't want) than in the passband (the bit you do want).