Those are two great sticks. I used to have a G940, then moved to the Warthog.
I do miss the Force Feedback Effect. However, when i fly with my cats on my knees, it replace it perfectly :) -
My friend who purchased the G940 from me, had reliability issue with it afterward.
I would suggest the Warthog over the G940. The stick don't move, but the stick full metal. It's something when you have it in the hand. You can fly the warthog with the G940, but not as smoothly than the warthog. It is also possible to put it easily between your leg, either by extending the stick, or extending the grip base. (I used PVC pipe with quick disconnect system).
Either way you choose, you'll have good time.