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Interesting topic.... not sure there is one answer, particularly as the weight issues can be contradicted... Having used BMW cars back as far as the 1970's (when we had much more snow in winters) weight in the boot always was the way to get more traction. Same for cars like my RWD Dolomite Sprint.
Are all things equal, tyre wise? Profile width, tread depth, tread patterns, that could be enough variables to make the difference, let alone weight itself. Even the front wheels can be the issue, how a tyre compresses the leading snow edge.
I'd be very interested in what the tyre sections are on both cars, as I suspect that has a lot to do with how each car cuts through snow and how much traction is generated. For example, there's a lot of difference in the way a 185 and 225 section works in snow, (let alone a 255 section) both for the ability to plough through fallen snow and the drive wheel grip and traction.
HighlandPete
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