I honestly don't think that it really matters for walleye, never caught a white fish so can't comment on them. I have caught a bunch of walleye using steel leaders so what I figure is that a snap swivel sure as hell isn't going to scare them away, as mentioned if you are using say a spoon then you will definitely want a swivel in there somewhere. That said I do tie on jigs as I think they perform a little better without the snap.
What I use is the following
Pike or pike infested walleye lakes: Titanium leader
Walleye: Swivel most of the time, direct tie on if I am only jigging
Trout: Most often direct tie on, odd time a swivel depending on lures I am using.
Perch: Direct tie on
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