I have seen and loved BOTH of these shows....I think they are the best two shows of last season. You really can't go wrong.
The biggest reason for you to see N2N first is definitley longevity. While I suspect N2N MIGHT make it to January (but not beyond) Hair most definitely will. I also highly suspect the cast will be mostly intact for Hair in late fall -- I'm sure most of them have a year on their contracts.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.