Fallser

There is no difference.  "Sili Legs" and silicone skirt material are the same thing.  It just costs more to buy them at fly shops.  I've been using the silicone skirt layers/spinner bait skirt layers for my flies for close to 25 years.  I buy them from tackle making catalogs like Jann's Netcraft and Barlow's.  I even use a full spinner bait skirt for some of my bass bugs.

 
If I'm tying 1/8 oz or smaller jigs, I prefer the the "traditional" materials, bucktail and marabou.

The only time I really fish for walleye is when I go to a lodge in NE Ontario.  For walleyes, we use 1/4 oz ball jigs. As the owner, at the time, told us the first time we went there. "You can bring any color jig you want as long as it's chartreuse."  Mostly we use live bait, nightcrawlers, minnows or leeches.  We either drift or anchor up and jig.  For soft plastics, we use mainly twister tail grubs 2 o 4 inches long.  We'll catch smallies and pike this way to. Also, we'll cast the jigs and retrieve them slowly or fast.  This year I'm adding Ned rigs and drop shot rigs to the mix.