I'm pretty sure my current set of winters fall under "sports/performance" winter category.
it's Dunlop Wintersports M3(happy coincidence on the name,

) tires.
I've experienced Blizzak WS series, Continental Extreme winter contacts, and now Pirelli SottoZeros.
it seems to me that performance winter isn't really for snow/ice. just dry cold tarmac.... it might be because i occasionally drive like a lunatic

,
snow and icy condition, my M3 just isn't able to maintain control unless i'm really slow.
even on dry tarmac, I've lost traction when temp went under -15 just accelerating straight.
absurd size might have something to do with it (for winter tires), but my Dunlops really not confidence inspiring unless temp is relatively warm (over -10) and road is clear.....