If you plan to be driving in the snow on a semi-regular basis, I would use studded snows. I don't have a pair for my SD yet, cause I tend to drive my pickup in the snow. If it's just on a rare event, chains provide truly phemonenal grip.

__________________
'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.