Even though I won't prove what I say, I'll give my take:
Madworld would sell a little better on 360 because the demographics of the game is closer to the demographics of the 360.
LittleBigPlanet would sell great on the Wii because it got a huge marketing campaign and games with lot of advertisement sell well on the Wii. This game also has a very broad appeal that would meet most the Wii demographics. Also, this game is really similar in concept to the 2D Mario which are strong on Nintendo consoles.
MGS4 would most likely sell as well on the 360 as on the Ps3 because it's what happens with multiplatform games such as GTA, DMC, RE5, etc.
Killzone 2 would sell better on the 360 because there is a huge audience for shotoers on 360: Halo, Gears, L4D, etc.
Valkyria Chronicles wouldn't sell well on any console.
PD:zero would most likely have sold as well on Wii as 360 as a launch title because Red Steel sold about as much and the first persons to buy the Wii are likely to have been N64 owners.