black ops 2. Although black ops brand seems to be smaller than the modern warfare brand in Europe, so it will be interesting to see if black ops 2(PS3) can outsell mw3(PS3) WW.
http://www.vgchartz.com/gamedb/?page=1&results=200&name=call%20of%20duty&platform=&minSales=0&publisher=&genre=&sort=EU