I am currently trying to decide which winter tyre to get for my GTI PP. The 3 options I am considering are Continental TS850 P, Goodyear Ultragrip Performance Gen 1 and the new Verdestein Wintrac Pro.
I am NOT considering cheap winter tyres or all-season tyres. As I don't think either are suitable for a performance car.
The TS850 tyres on my wife's car are excellent in winter and predictable in warmer weather. It's no wonder some people recommend the newer TS860 as an all season tyre. So I'm leaning towards the TS850 P.
I'm not buying a second set of alloys. I'll just get the tyres swapped onto my stock alloys. I have tyre storage bags to transport and store the second set of tyres in.
Edit: check out the tyrereviews.co.uk website. There are plenty of reviews and some good videos on the subject too.
Edit 2: I would NEVER take advice from a tyre depot! I have had bad advice from several of them in the past.