I've play Football Manager, Championship Manager, Fifa Manager, Total Club Manager, and many other Football Managing game.
For me, Fifa Manager is the best managing game because I hardly get bored when playing managing game compared to other games

So, whats your opinion about it?

i love fifa manger than others
i dont know why but i prefer than others

The concept and layout for Football Manager and Championship Manager are quite similar actually. For me both of this game is the best from the rest that you listed above. These 2 games is really seem like real. Try it and you will addicted.

Football Manager 2008 is the best Football managing pc game until now ! Great gameplay and very very realistic ! Love this game ! Don't know what you like at Fifa Manager ! I like only the graphics of that game, but the gameplay is ... shit !