Depends on the sport. For football, basketball, MMA, and golf I like defense.
On defense in football all you have to worry about is hitting the ball carrier, covering your man and minding the gaps. I was never a good enough runner to be a real offensive play maker. What I am good at is seeing the crease and smacking the hell out of whoever is running through it. Also sacking a qb is one of the most satisfying things ever. High school wanted me to be a QB, I'm a tall strong lefty, but my Dad never let me play for the school (didn't want me getting hurt) so I never got to see how that would pan out.
I'm mostly garbage at bball, except I can shoot, and defend in the paint. I can't dribble for shit.
In MMA I love to counter punch. I've got a pretty good chin and absorb damage very well, so it's ok if I get popped, and people usually way overexpose themselves when attacking. Learning to be evasive pays more dividends than being a bull in a china shop. That being said, I've got fairly good legs and really like to leg kick the other guy at the beginning of the fight to take his base away from him.
I probably competed in golf at a higher level than any of my other sports. For a long time I was pretty aggressive with my shots and drives, but as I grew in my teen years, I started hitting the ball farther, and began to swing too hard for some of my graphite shafts. This forced my to get really good with my steel shafted irons and wedges, which led me to become a more conservative player which improved my scores more than anything else I ever did. I didn't get a proper set of clubs (for my size, my old clubs were from my early teen amateur days) until I graduated college. I've been trying to get better with drive consistency, and my wedge play from the sand. I play my best when I'm conservative in my shot calling which some would call defensive.
For Tennis, volleyball, baseball/softball I like offense.
The first sport I ever played was tennis, and as such got very comfortable with a top spin heavy ground stroke cannon/attack the net style of gameplay. I'm a fairly aggressive person, and in tennis you can't really be aggressive while playing defense like you can in football or MMA. Being tall, and a lefty, I had a big serve and was holy terror at the net. My biggest problem in tennis is that I would push too hard and beat myself with unforced errors. I'm a better doubles player where the work load is split and the game gets more strategic. If I can get more patient in the point and really start to try and pick apart my opponent with smart as opposed to strictly aggressive play, I could be a much better tennis player than I am.
I love volleyball. You hardly have to run anywhere and if you have ups your golden. For a guy my size I've got quite a vertical leap, and being a tall left helps here as well. I wanna be at the net spiking the hell out of it and blocking the opposing teams play.
I started playing baseball young as well. If my arm wasn't busted I might have been able to pitch, but I prefer playing first base or catching. But what I really love doing is batting. From playing so many sports where I hit a ball (tennis, golf etc..) I've got really good eye hand coordination when I need to hit a ball with a stick of some kind. I'm also a lefty and big so I can hit it to the weaker parts of the field and also put balls in the parking lot.