It is difficult to have a ranking of top strikers. We would need something similar to baseball stats :)))
Among the current top strikers I see Henry, Ibrahimovic,Eto'o,Shevchenko, Drogba, Nistelrooy, Torres, Chevanton, Mutu, Kuijt...

From the past...Cantona, Ian Wright, Hagi, Litmanen, Matador Salas,Skuhravy, Casagrande, Gigi Lentini, Stefan Petterson etc