I've got one of each. The hammered has an extra layer of veneer, so it might be worthwhile . . .

The worst cold experience I had was in Iowa, visiting a college at the end of January, 1996. The cold wasn't so bad--3 degrees and a -30 windchill--but the snow was blowing so thickly that I couldn't find any of the buildings. I got within 15 feet of the anthro building, which is a massive red stone Romanesque, before I could tell there was a building there at all. Then next day was clearer but the temperature hadn't risen and I had to stand out on the corner for 5 hours waiting for my uncle to come pick me up (he wasn't familiar with the town and I told him I'd be watching). I'd stand outside for an hour, thaw out inside for 15 minutes, go back outside . . . They still didn't cancel classes, and, crazy me, I decided to go to the college in spite of the ordeal.