There’s no debate for which of the two looks better. The SelectionBox is fat and ugly, and Studio’s selection box would be warmly welcomed into the API. Please give us access to Studio’s selection box.
I would say SelectionBoxes just need a thickness property. We already have color and transparency. Thickness would allow us to mimic the studio selection box.
It would also be cool if there were an easy way to change the properties of the StudioSelectionBox, so we could make it thinner or transparenter to see small parts easier.