You can freeze vodka (well it won't freeze) and quite honestly taste wise, I have no clue, Vodka always just tasted like Vodka to me, if I wanted to have less of a hangover I'd buy the more expensive stuff but I wasn't a "Vodka aficionado" although I DO like good wine.
I drank it for my Russian heritage. And, I salute the Russians for like, finding something fun to do with potatoes (and, also, ANYWHERE in Russia to have fun) but think about where they stored it. I mean, their homes were probably BARELY above freezing anyway. If you are dying to hoard also alcohol for the vacoopalypse (and I do not blame you) vodka should do.
Of course, a good wine only ages when you like, store it at room temp, for QUITE a long time depending on the wine.
So really you have options.
Anna