i had to pick mine at about 5 weeks from beg of flowering because spider mites where destroying her and after being dried and cured it gets me fucked up for a whole hour but on the other hand a good ammount of the buds are all airy as they werent developed properly. it also depends on the strain and the conditions it was being grown in
The difference is big enough to wait. Your buds will be much smaller and the cannabanoids will be kinda out of wack...too much CBC not enough THC that sort of thing...