Sprint 4G vs. AT&T 3G [Chicago]

I had to pickup a Sprint Overdrive 4g/3g card for work recently and put the two networks head to head using Speedtest.net. Here are the visual results:

Sprint 4G

Sprint 4G (Test #2)

AT&T 3G

“]So who is the winner? AT&T?

Sprint: $60/mo for unlimited 4g, 5gb of 3g.
AT&T: +$20/mo for tethering, unlimited if grandfathered in [source].

The real test will be reliability and whether or not the AT&T / iOS tethering actually happens.