Who is better Zlatan Ibrahimović or Alberto Gilardino?

I want your opinion on who is the better striker from Zlatan Ibrahimović or Alberto Gilardino. In the last 5 seasons from the begining of the 2004-05 Serie A season until the end of the 2008-09 Serie A season these two strikers have been the most prolific goalscorers in Serie A. In these last 5 seasons Ibrahimovic has made 158 Appearances and has score 80 Goals. Gilardino in these last 5 seasons has made 165 Appearances and has scored 78 Goals. Now I want everyone to remember that these are SERIE A appearances and goals and exclude all the other competitions. I want honest and non biased opininons. So no favouring any of these players over attraction or the teams that they play for.