Spades like to explore and dig around in the game to expose new tiles, new strategies, how the rules work, that strange little rule that no one ever uses and why it is there.
Hearts are there just for the social aspects of the game - they like to be with people and the social interactions are what is important to them. The game is secondary to enjoying the company of the people around him. During the game, they will help out other people, offer to learn the game to teach to other people, assist them with strategy or point out rules they may have missed (" you forgot to collect your income this turn").
Clubs, all they want to do is beat people - winning is all important to them and they can not enjoy themselves unless they win.
