Let's say you have a set of really nice soapbar pickups, one is a single coil, one is a dual coil humbucker. Both pickups are in identically sized shells. Would you rather install them in a J/HB (single coil at neck, humbucker at bridge) configuration, or HB/J (humbucker at neck, single coil at bridge)? The humbucker can not be wired with series/parallel or single coil mode switches, if that makes a difference.