x mart aluminium (and I don't watch top gear) is the best as they use so much of it in their frames that they are nearly solid.

We've been riding aluminium bikes long enough to know that as a frame material for bicycles, it is fine and one should consider that most of the parts attached to that frame are also made with aluminium.

I have seen more cracked and broken frames than most of the people here combined and most often it stems from impact damage or poor manufacturing processes.