I doubt Sony has released more first party games for PS3 + PSp than Nintendo has for Wii + DS.
And with the way things have been going for 3DS and the 1st party support I expect for Wii U in the future, I don't think that's going to change.
Sony has always been stronger with main console sales than Nintendo without having to go casual. Their first party is growing at an alarming rate. If it grows anymore by the end of this gen they will have eclipsed Nintendos IP list.