A longer sight is suppose to make you more accurate. It only makes sense. When you shoot, you are basically lining up three things 1) your eye/anchor, 2) your pin, and 3) the target. The more centered you can get the pin between your anchor and the target, the more accurate it is going to be.

The fine line is that it is harder for some people to shoot with this setup. Even though it is suppose to make you more accurate, it can actually bring you down. Not to mention the nice price tag that comes with them. Like Greg said, I would get the best hunting set up for you and go from there.