The DC10 is a stronger aircraft wing outboard - even Lockheed admitted that they use a 'light weight' structure outboard to reduce weight and increase aerodynamic efficiency.
In my 32 plus years on the L-1011 program that is the first I heard that the we used "light weight" structure in the outboard wing. In fact here is a quote from the L-1011-500 Technical Summary: "It should be noted that the adapation of the active controls is unique to the L-1011, which has a wing structure so stiff in torsion that there is no need to dwell the outboard ailerons in high speed flight."