Originally Posted by
Lombard
The reality is that you can make a good bike frame out of any of these metals, with any desired riding qualities, by selecting appropriate tubing diameters, wall thicknesses and frame geometry.
While true, you just can't get away from the simple fact that some materials have a higher stiffness/weight ratio than others. Some materials are also easier to manipulate/shape and fabricate than others. Some materials are also more expensive than others.
So you just have to pick some priorities when choosing a suitable frame for your needs and budget.