Series wise, Simple series, 97 indv. games on the ps1, runner up, kinect series with 25 on xbox 360.
Sku wise, 24 Tom Clancys on the Xbox 360.
Sports wise Madden with 15 on ps2.
Actual franchise wise, its like a 12-way tie. Most of which are on the Xbox 360 FOLLOWED BY the o2.