I'd rather have the Explorer than the Edge.Edge ST but replace the following:
Engine = 3.5L HO Ecoboost - 450hp/510tq
Transmission = 6 speed unit from 2015+ Edge Sport modified to handle the extra hp/tq.
Suspension = monotube dampers from Edge ST(they are excellent) but add higher rate springs and lower additional .5" over the current Edge ST.
Brakes = Explorer ST units with performance pads and some air deflectors on the control arms(a'la porsche 911)
Wheels = 21" current Edge ST wheels with the 265/40R21 PZeros. Make them as light as possible for increased performance as the current 21" wheels are stupendously heavy.
Keep the Edge ST body kit but get rid of the shitty fake exhaust pipes and plumb two 3.5" exhaust tips. The styling of the Edge ST is there with a few body tweaks but the powertrain needs to have way more oomph to impress the people looking for a performance SUV.
The Explorer looks TONS better.