Hair parts generally have been categorized as "Continental" if on the left side and "Western" if parted on the right side. Recent studies have suggested that men who part there hair on the left side are often popular, successful and perceived as strong whereas men who part their hair on the right are viewed as more radical and open-minded. Men who part their hair on the right side have been strong enough to overcome the stigma against it.
No matter what you subscribe to, the side part is widely regarded as on of the most poplular hair styles in the world for men. The look first became popular in the 30's and 40'swhen only oil based pomades were available and thus, the classic style is often flatter to the head. Modern looks have more of a tousled effect or a pompadoured feel. You can pretty much style any men's cut with a side part-- from short tapered sides to long academic looks. Short hair on the top looks best unless you are using heavy product and styling close to the head. The side part is often used by men when hair begins to thin to give the illusion of thickness.
Choose to believe the studies if you like but the reality is you should consult your barber on which side suits you best based on your facial features and hair growth patterns.
What side are you on??