I like the mono over the steel because the original was a mono and the aluminum is beautiful! That is pretty unscientific but there you have it. I would love to race with anyone who can tell me the difference in torsional rigidity between two cars by the way it handles. I am sure I could learn a lot. I really don't think that is a factor at all in most guys minds when they are choosing a gt40. I can't imagine anything stiffer than my RCR with the 6 point cage!
Well.....maybe that!
(When i heard It start for the first time!)