I doubt that a World Cup winner would turn down the trophy for a cash substitute).
No some of them would prefer both. Did you realise how much David Beckham gets each time he is featured during an ad everytime England plays? How much do you think these players get evertime they do play and the further and further their team gets in the event, i.e. Euro 2004. I believe that if these players did get just the trophy and didn't get any cash, then they wouldn't bother. My opinions.
Anyway if I was given cash then I probably wouldn't have anything to show for it and it would only make me happy temporarily until it had gone.