Mild steel or Alloy steel subframes?

svtpower said:

Mild steel or Alloy steel subframes?

http://www.partshopper.com/fordmustang/Items/ST-555-5220.html

or

http://www.partshopper.com/fordmustang/Items/ST-555-5320.html

Is it worth the $20? Are they lighter? stronger? or what?

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