Ma'a and Sonny are key attacking weapons, Sonny at the moment seems to be the more consistent one but thats probably due to his team. Sonny's defence is better than Ma'a's IMO, lets not forget Wynarrd Olivier fending off Ma'a for a crucial and awesome try, if that was Sonny in that situation his long arms would've wrapped up Olivier IMO.

ABs need Ma'a though he has a more rounded game than Sonny has at 12 and Ma'a is just a handful.