Honestly, they look and fish identical in my opinion. I have both. The difference to me is that one says "wiggle wart" on the underside of the bill, whereas the new ones say "Storm". and some of the colors are not the same. But even different batches of "vintage" wiggle warts look different colors/ shades.

for casting, I agree that the single siwash is good. not only are you legal in all rivers (if you fish several different systems, with different rules in effect), but it lessens the chance of your hooks getting tangled in one another.

Besides Hot Shots (which I almost exclusively fish for steelhead... pulled, not casted), I also use trebles on Tadpolly's. Basically, my steelhead plugs get trebles, salmon plugs get single siwash. Your anti-snagging rule syncs up pretty much this way.