I've raced both and Hallett is way ahead. MAM is fun, the facilities are nice, but the gravel road in is a bitch. You spend all your time cleaning up from that white limestone fine dust that gets in everything. I raced Hallett when it opened in 1977 and it is every bit as much of a challenge now as then. I wish they would do the "backasswards" race again, where we ran clockwise. Stay at the track. Lots of social activity going on. I've been "adopted" by several racers over the years because I go to most races by myself.