Adam, the Arrow will have a better useful load than the new Archer. The new Archer's simply don't carry that much, especially with a/c. Less than 500 lbs in the cabin with full fuel.
The Arrow is faster, has a little more oomph on takeoff but in most respects feels much like the Archer. I can't remember what year Wing's Arrow is, but the one I flew a few times was a '72 with the Hershey bar wing, and it dropped out of the sky like a rock with the gear down when you cut the power. That was the biggest difference. The Arrow is faster, and for the same money it just makes sense to me to rent it. Wing's is a nice looking plane in and out, and decently equipped. Another advantage is that it's schedule is much more open than the Archers and Skyhawks, or was until the price increase. I don't know if that will encourage more people to rent the Arrow or not.
Do you have any idea why they raised the price on the Archers and not the Skyhawks? Also, did you note they now have a 2 hr a day minimum on multiday rentals? Guess that isn't much of a big deal. Most multi-day trips I've contemplated or taken put more time than that on the hobbs.