With regard to assumptions that a given smash game is more technical than the other:
Until empirical evidence is presented (i.e. numbers, not just words), each side is merely just blowing smoke about which game is more demanding. You can say what you like about an individual technique being harder, but unless you can prove it, your words are hollow. But more importantly, we can all agree that gameplay as a whole is a better gauge of technical demands than a brief combination of buttons.
Thus, I would like to share the following
LINK. The link presents research which examines the technical demands of Melee at the upper levels of tournament play. At the bottom of the OP you can find a summary of the data. I do not know if similar research has been done for Brawl gameplay, but I would be interested to learn about their findings.