It all depends on what you mean by better. As seasoned hunters know very well, a shorter carbon arrow will usually fly faster than a longer, heavier one. However, lighter models are known for having a reduced force when it comes to penetrating the target.
On top of that, the performance provided by the arrow depends greatly on the type of setup that you are using.  Therefore, provided that you have the right kind of bow and arrows, you won’t notice any difference.
On average, longer models are more flexible than shorter ones. Yet, a model that is too long might be rather impractical to carry around. Similarly, if you are using an arrow that is too short, you risk injuring yourself by shooting it into your hand. For an arrow to fly safely, it has to extend past the position of the riser on the bow that you are using.