Mild steel or Alloy steel subframes?

[svtpower]

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?

 

[Uncle Meat]

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?

Minimal weight difference between those two, but the alloy is much stronger than the mild steel.

U.M.