Winter bike / Snow bike thread

I've got a 38c cross tyre I was going to sell, but now I'm thinking of keeping it for the winter.

If you had a 32c and a 38c which would you put on the font and which on the back?

First instinct says biggest on the front... but then as they're both biggish, I can also see an argument for having more grip where the power comes from...

Thoughts?

I run a slightly larger tire on the rear for striaght road use (as the rear take more weight). But when traction becomes an issue (off-road/winter), you want a fatter front tyre.

For mixed riding (ie. british winter), its tricky, but I'd say front.