I've driven both and Hallett has more challenges than MAM. I like MAM in that its all new and roomy and clean feeling and the people are nice and the track is fast and helps you stretch out a fast car.
Hallet is older and has a kick back kinda feel to it. The track has lots of elevation changes and you feel like your always turing. Much like a stretch out autocross. This track favors a slower car. Also I think the cleaner driver will shine better at Hallett. Its not as critical to hit your marks at Mid America. Personally I would run at either course for what they both can offer. My group - ProbeTalk.com has rented both tracks before and for ease of renting and sales and other stuff, MAM went smoother and the people were more accomindating. That was a few years ago.

Whatever you choose I think you will enjoy it.

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Toodles,
Stacey_B AOL IM: SCCAStaceyIB 1990PGL SCCA STSL "Girls Do It Better" Cal Club T&S, BWRP,WS,Lag,Hallett www.scpoc.com : www.probetalk.com Racing is my life. Winner One Lap of America 2003- SSGT2 class 1996 Ford Probe GT.