The best sports are competitive
Anglų esė. The best sports are competitive.
On the other hand, if you compete with friend, you can broke your friendship with him. For example, if you are competing in the same football cup and he is playing in other team, and if you win, he can be really angry about you and with that winning you can loose your friend.
In my opinion, competition in sports is good but you should avoid competing with your friends, it is better to be in the same team. I enjoy sports that you can bond through with your teammates rather that create conflicts.