I has Michelin AS3's on my old EB, solid although then I wish I had real snow tires.
I daily'd my old girl, so rain, shine, sleet or snow, I was going places
Have to ask, what trans are we talking?
As @Stoked said, you're gonna need a new clutch if you go St1, so that makes a $700 flash more expensive, while I can't speak for experience about the Mustang.
Ex had a blue Golf 1.8t, that thing was a Champ for what it was, took it from Alamoghetto NM...
Like Bobby Brown thanked Freddy (Frank Zappa), got my friend to thank for pulling me right back into Mustang's, as he's too busy with life and relied on me to help with his V6 build, and then for fun, I'm scouring the market place for cheap mods to throw into it.
Of course, get's me thinking...