I was a big fan of tcm 2003 myself, maybe that was because my old comp could not handle cm4.
But after getting a new comp I bought Tcm 2004 and cm0304 at the same time and cm is by miles the better game. Tcm is Unrealistic u can buy any player if u have the money.
Of course it has its own advantage like expanding stadium option and the option to merge it with fifa 2004 and play with your tcm team in fifa.
But cm for me.