I've done a little research :
- on 83 Wii million-sellers 57 were from third parties (67%)
- on 62 PS3 million-sellers 47 were from third parties (76%)
not a huge difference, but...
- on 83 Wii million-sellers 34 were released in 2007 or before (40%) and only 2 in 2010 (2%)
- on 62 PS3 million-sellers 11 were released in 2007 or before (18%) and 6 in 2010 (10%)
conclusion : many Wii million-sellers actually hit 1 million in 2007-2008, when the Wii hype was at its climax and since then, the number of Wii games hitting 1 million has slowed down as third parties withdraw from the system and as Wii becomes less popular.
Many Wii games are close to 1 million so it will be difficult for PS3 if those games keep selling. But as for new releases PS3 will achieve more million-sellers since Nintendo alone cannot offset Sony & third party support.
