Given that I don't care for lifts ...
Maybe. It depends on your goal, and your wallet.
The RS9000XL retail for about $99.00, but I have seen them in the mid $80.00 (Amazon). Assuming $85.00 each and $348.00 for the lift, that's 4($85) + $348 = $688.00. The Rancho QuickLIFT looks to be about $160.00 each, that's 4($160.00) = $640.00. To me, $48.00 should not be the determining factor. Then I look a versatility.
You can change shocks with the Traxxx product with no other change needed, but should you want to change shocks with the Rancho QuickLIFT, this means you lose the lift and you're stuck with another Rancho, some other shock-lift combination or some sort of Traxxx product.
Something else to consider is that the that particular Traxxx product is a fixed lift and not height adjustable, as is the Rancho QuickLIFT.
I do not see a Rancho QuickLIFT application for the 2007 ST. Perhaps the Explorer application will work, but I don't know. If not, your decision is made for you.
So, on one hand there is the height adjustment of the Rancho QuickLIFT, but you may feel stuck with the product (okay if you like it), if there is an application. On the other, the versatility of simple shock changes with the Traxxx. Either way, you'll have the damping adjustment of the RS9000XL.