I don't think it's a good strategy to adopt only one of these strategy game( meaning play slow or aggressively).In my humble oppinion poker strategy game should be varied meaning playing slow sometimes and aggressively others time depending of what cards you have, who are the opponents,how many chips you have.....I prefer to play poker with caution, thinking of studying the hands of my opponents and only being aggressive when you have a very strong hand and with a great chanche to win.