Aerial side B (or Aerudo for short) is useful in a different way from grounded side B. Aerudo has a shorter startup time but a longer cooldown time if you miss, I think. But more importantly, Aerudo doesn't have any guaranteed followups, as opposed to grounded Gerudo which has guaranteed Dtilt, Dash attack, jab, and/or Ftilt against a large portion of the cast. And Aerudo does less damage IIRC.
The biggest reason to use Aerudo is as a mixup when you're landing. Space yourself like you're going to hit their shield with an aerial, then side B instead so that it goes through their shield. There aren't a lot of command grabs in this game so not a lot of people expect it.
As far as the Ganon boards go... see for yourself, it's as dead as a poe in here.