hmm it's been made before, but not askign why....
myself? i would probably use the wiimote+ chuck,
a) i'm used to those controllers, i've been using those controllers for the past year lol, i'm pretty sure it would be easy as pie to adapt to playing brawl with them
b) only have 2 cube controllers, and 4 wiimotes/chucks, my friends would probably perfer the cube controllers so now i can let everyone in the room comfortable witht heir controls and playing at their prime
c) if i play brawl for like a month straight.....im going to lose my wiimotes/nunchucks, which i don't want to do
d)it's new, i'd probably be better with cube controlelrs but it would just be boring going back to them, it would feel like melee. 2.0 instead of brawl