Size sorts? - sunfish sure do! For better size though I don't change baits so much as move around. They don't seem to mingle so much as the smaller sunnies. What I normally see are localized pods of the larger fish keeping more or less to themselves, and even at times seeming to associate with larger crappies. I don't fish bluegills and sunnies hard though, but I have not so much seen a difference in bait preference so much as sizes sorting out to different locations.

One other thing needs to be said and that is heavier fished waters don't tend to grow so much size in any panfish as less fished ones, and some waters simply cannot grow the larger sunfish at all.

No sunfish are legal bait to fish with in Minnesota, but were they, they would take muskies like a dream. Every once in a while someone will ignorantly hookup a sunny and toss it out for muskies. There are times you simply cannot say something to them quick enough before they are hooked up. In a lot of waters, they also take bass like you mention.

That having been said our largest bass of this past year at 23" and big in the belly came on an 1inch and a half crappie tube last spring. So did about a dozen others at 20" and over (two man team, which is usually how we go). That was all fishing crappie sized (inch and and a half tubes up to 2" BG and Lake Fork plastics, and down to 1" all in early season UL crappie fishing. There were also a couple of bluegills that beat 9".

We also did pretty well on medium sized sunnies and crappies on metal spoons, like smallest Phoebes last spring, too, but not in the past few months. In a lot of the places we fish, they are often both present, even if usually not actually mixed.

Our lakes were close to 3' deeper last spring. Real dry here last summer. Our quarry all moved off to other structures this fall and we are having trouble finding them at present, and when we do they are keeping their heads down in what cover they can find on the bottom. Water quality has got to be way different now, too.