I can help with all three. I play them all actively.
I also play ADV UU/ubers but not NU, GSC Ubers but not UU, and RBY Ubers but not UU (I played the old RBY UU but BL got merged with it and I have only played like 4-5 games of it after the change). I'm not as familiar with these as with OU though.
__________________
|