Nintendo still hasnt confirmed that we WILL have a choice yet. Although it is very likely...
I will definetly be playing with the wii remote/nunchuk. For many reasons:
1. It will offer more of a challenge, extending the lifespan of the game.
2. I have 4 wii remotes/chuks, but only 2 cube controllers.
3. Simply because I like the wii remote better.
I am still crossing my fingers that ninty will make a 'cube controller online' and a seperate 'wii-remote online' because we all know that cube controller vs wii-remote wont be fair. Also because I dont want to waste my time looking for hours for someone else playing with the wii-remote to brawl with.