I am in no way shape or form advocating cheating, but do you have to be able to show the results for this project? Just saying... I will hook you up with a vote for ported just because there are so many more options with a ported box over a sealed box.
Well all I've had is sealed boxes and I've had good results for them, so I pick sealed. I haven't had a ported box yet so I can't say for sure. When I'm able to trade my car in for an SUV I'll be going with a ported box.