I had a pair of blizzaks on my 19" rims on the M3 (don't ask why) and they were pretty good.
As for snows vs all seasons......snows every time. I used to swap my all seasons for snows on my Volvo XC70's every winter.
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Member ZSCCA 2009 Z4 s35i with Dinan Stage II software, Sport and Exec packages, 19" 296 rims , a stubby and mud flaps
'03 Z4 3.0i Sterling Grey (Hers)
'01 Z3 3.0i Sapphire Black, M sport package (Mine)
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