[Closed] 20'x20' building. Brick,timber or steel?

I want to erect a new shed with a pitched roof in my garden. Not sure on which material to build with though. Currently I'm leaning towards steel but have no experience of them. Do they condensate?, are they robust? Seem gvfm. Quite agricultural looking though, but I do stay in a country property. The shed will be used for keeping my Defender,storing bikes, tools, firewood etc. Which material would you choose and why? Any experiences of building with steel would be greatly appreciated. Thanks.