I think your 'style' is very much shaped by the sensei you start with. However I'm a firm believer that different things work for different people (due to strength, height, bodymass, speed, etc). I think the best thing to do is to do what works for you. This is the great thing about training on courses - you can try very different styles and pinch whatever you like from them, and disregard what you don't (but obviously after the course!).
I started off with a very hard style which was effective in the same way jujitsu is effective. I am gradually trying to soften this style as time goes on, but soft and effective seems to take me longer to achieve than hard an effective!