For my money, a swim jig and a spinner bait are fairly interchangeable as far as where, when & how they are fished.
But a Swim jig, a Lipless bait and a Crank bait, to me are three totally different tools. Clearly an angler can chose to fish any bait any where but to get the most out of it's potential, choosing the right one for the job makes sense.
To me, a swim jig is a fairly subtle presentation. Even with a beefy trailer and through some decent cover, a swim jigs ability to roll and glide as it swims is what makes the bait work. On the other end of the bait spectrum is a lipless or Rattle bait - loud and fairly obnoxious, this bait doesn't ever sneak up on any bass. It screams "here I am - Bite me". As for a crank bait, depending on the model and it's features, it can fall any where in between those just mentioned. Can be loud, can be silent, can be subtle (as in balsa wood baits) and can have a wide wobble or a tight wiggle. But the best feature and most attractive quality of the bait, is it's ability to draw strikes by deflecting off something; whether is loud or not may play a secondary role here.
That's my story and I'm sticking to it.
A-Jay