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The main reason to go smaller (in wheel size) is because smaller tires are cheaper and there is more selection. I haven't checked tirerack.com (it's the goto website for tires over here in the USA - it lists many tires you can get over there), but I'm guessing there are only a couple RFT winter tires that you will find in 19".
You should also check out a couple tires that tirerack doesn't carry: Falken and Nokia (Hakkepelitta). Don't forget that, if you go with 18" you need taller tires (bigger profile) to maintain the same diameter. Most of us also prefer a square (non-staggared) setup for winter: the smaller size at the rear allows chains (cables) to be fitted without clanging on the body-work.
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