I use the more expensive barrel type w/ better snaps because of the smaller profile. I have no idea if one is better that the other. Sure, lures spin while being cast but line twists that need attention come mostly from snagging a branch or little bass that kinda feel like the bottom and lakers.

I honestly don't think the ability of a swivel to spin matters. When I get snarls I cast and reel in, stop at 6' or so and let it spin past neutral, cast again and do the same thing until the spin is gone. (Letting line out and paddling never worked for me.)

It seems to me line will twist easier than any swivel. A few casts work for me but I'd love to hear other opinions.

Interesting point of view on this.
I do use Mepp's type spinner both in Q for larger species, and while fishing for smaller stream trout.

I have more line twisting issues if I tie directly to lure, than if I use a quality snap swivel?

I've also found that you need to keep swivel size in proportion to the weight of lure so it will swivel properly.

I "thought" the resistance of the lure, is what turned the swivel or should turn it.

I don't use bottom bouncer sinkers, I use the keel weight type with the chain swivels, and have had no issues with line twist.