[SmokeyJ]

You pretty much summed it up (although a lighter shallow wiffle spool is always better for pitching and flipping even with heavier lures, and I would say sub 1/2oz, not sub 1/4oz as the weight I would switch from one type to the other).

You can throw heavier lures on a shallower wiffle spool, but you won't see much benefit AND it will be "hotter" and easier to backlash. Also, if you are using a shallow spool and get hit on the end of a very long cast with a heavy bait and the fish takes a run, you run the risk of getting spooled.

You can throw light baits on a deep solid spool, but your distance will suck.