Having done a lot of engine mounts, I concur with everyone above on the quality of most aftermarket parts. They frequently have the strength of wet spaghetti compared to OEM.
That said, if they're easy to swap I've used the offshore mounts as it can be more cost effective in the long run. You'll just change them more frequently.
Confused a bit on "upper left" mount. The Edge uses three mounts for the drivetrain: Right, left (transaxle), and rear (torque strut). Side indication is always from the driver's seat.
The left and right mounts support the drivetrain; the rear mount controls fore/aft motion caused by engine torque. The rear (and front for vehicles so equipped) typically wear faster as they're under more stress. The left and right mounts just kind of sit there in comparison.
The right mount is hydraulic (fluid-filled).
What led you to the bad mount diagnosis?