I go on both a lot bit.
Like junglist I find the passive agression too too much to deal with.
People are far more likely to take offence in a 'omg you have really upset me now' sort of way. They seem to actually look for a reason to get upset. They are rarely challenged (unlike mean ol mumsnet)
If there is any sort of DV thread or rape thread someone will ALWAYS pop up with 'what about the poor men no one cares about them' comment.
Tons of trolls who are hardly ever caught out.
Lots of 'I am going to end it all' threads
BUT a good place for people who are not so tough to go. Also if your standard of grammer, spelling, general education is not so good you will be a lot safer on NMs. You dont have to be articulate to get a chance to state your views. I think some posters on MNs forget that you dont have to be able to put your views clearly to have a valid opinion.
Sometimes people need a silly hug and unconditional hunning.
You rarely get a good debate on NMs because the thread will get pulled. I find this very annoying as blatant racism gets ignored.
I think there is a definate place for both sites.
MNs can come over very snobby but then redeems itself by challenging predjudice.
NMs drives me mental because of the narrow minded posts but then just as I despair people come out of the woodwork and also challenge the bigotry (then the thread gets pulled).