It depends how old you are IMO. Older people are all over North Lake. Not old people, but guys getting into BASE jumping, sending the Chimney with backflips etc. Guys like Kent Kreitler, Scott Gaffney, Shane McConkey comes to mind. Lots of badass dudes in their 30's and 40's that would put most normal people to shame with their athleticism and skill from a long time of skiing.
After living in Squaw for a long time I'm amazed at the people that live in North Lake. South Lake is casinos, tourists, and kids. Super fun to drive an hour down and have a good night, but north lake gets my vote.