Interesting discussion. I do girls in NY (NCAAW rules, NFHS for boys). Why? Don't know.
According to the NYSGBOA on a double whistle foul (2-man), the call goes to the person whose primary area of responsibility the play is in.
Sometimes hard to do when it also states that both officials are on ball when the ball is in the paint.
As far as the block/charge it states "When in doubt it is a charge. Don't penalize good defense!!"