I would think the different materials would make your choice.
Couldn't tell you one from the other, but I added room under my seat by doing this ... Rear Seat Mod
The Blue(ish) Beast. 7.3 manual, 6637 Mod, Hutch mod on a steel aft axle tank, pre-pump fuel filter, coolant filter, LED rear lights, HPx, front axle rebuild, transfer case replaced, rear (clear 1 piece) window replaced with privacy manual slider
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