Odlov is right. Each serves their own purpose and should both be used depending on the situation. If anyone really believes that relax style is better than hold style, I would like to see you try against MINE! But relax style has many advantages, and also has lots of disadvantages. Same with hold style. But if you know the physics of the game, you can potentially bring both to a frighteningly powerful level. Noobs believe that relax style looks more pro, but it is not true.
Also, usage of a mixture throughout long frame games is what most pros actually use, and neither should be underestimated.