Well as far as clean goes, they ARE high-output humbuckers after all. That said, it really isn't all that hard to wire a JB or Custom for coil splitting. You can get a great clean from either of them that way, especially the JB (people never shut up about the strat-like cleans from a split JB).
But in the end, certainly the JB's upper-mid peak gives it a crunchiness that you won't get in the SH-5. The SH-5 on the other hand, is about my favorite Duncan humbucker for one very simple reason.
It is, to me, the voice of rock. Good old PAF-based rock...only with the kind of oomph you'd expect in a modern humbucker. It's not overly bright, but there is clarity to be had, and drop D is a a delight. It sounds outright mean, yet classy.