The problem with a thread like this is it's going to be completely biased to what the person has been in or is in. Ask a bunch of people down at graal city, they'd probably say their High School guild or Modeling Agency is top notch. Not exactly sure, but that's how it's turning out to be.
Oh and Goat, yes Zanza is a family guild. Has been on iClassic since Feb 16 2010 and probably even longer on PC Graal but I don't know much about that.
Edit: As for my picks, I wouldn't really care. Just so long as I'm happy in the guild and everyone in the guild makes each other happy. Everyone has their own opinion after all.