Having trawled the many forums for many hours before starting my new steel 6x4 machine i noticed a very real divide between Aluminium build thought and steel build thought, from what i gleened there are both fors and againsts for both material types. then yesterday whilst browsing i saw this...

http://en.wikipedia.org/wiki/Ultimate_tensile_strength

When i look at things like the human hair in relation to said materials it makes me laugh.

So my questions are these.

1/ What are the pros and cons of using Steel...
2/ What are the pros and cons of using Aluminium...
3/ How do they compare to each other..

I have asked my questions in a very specific way so as not to make it into a direct comparison until question 3..

Rick