I think they consider all of it. I got a 730 CR, 800 M, and 800 W (superscore). When I asked admissions, they told me they considered all parts of the testing, and not just CR + M. I guess it's if you trust what they say verbally.
haha I'm the opposite, neorobie! My writing is my best and my math and CR are just a little above average...hopefully Penn saw something more than my scores when they looked at my app.