Aluminium or Steel for a track bike frame?

I'm looking to buy a track frame to use for a fixed gear bicycle, mainly just for riding around town, I might race someday though. I know aluminium is supposed to give a much harsher ride, but I'm unlikely to be using it for really long rides, so I was wondering if it was significantly lighter than a good... show more I'm looking to buy a track frame to use for a fixed gear bicycle, mainly just for riding around town, I might race someday though. I know aluminium is supposed to give a much harsher ride, but I'm unlikely to be using it for really long rides, so I was wondering if it was significantly lighter than a good cro-mo frame. I'm really into the whole urban fixie look. All that said, however I'll probablly end up buying whatever is the cheapest track frame on ebay, seeing as I don't have a lot of money, but if I do have a choice, which should I pick, aluminium or steel?
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