To Snow or Not to Snow - Sodor Construction Co.

Hey all. I've been looking into starting my collection of road vehicles, and it seems the most common ones on eBay are the free-wheeling members of the Sodor Construction Company, and especially the "Sodor Snow Storm" versions of them. I just realized the snow storm versions KIND OF make them look like they're dirty, but I don't know just how white it would look in real life. Would you guys suggest using the clean, more expensive versions of the Sodor Construction Co., or do the snow storm ones actually make them look like they've been hard at work, and not just snowed on?