Let me give a try, there is no difference as an absolute rule, It depends on both teams players. If you have skilled MC/AMC's and the opp. uses only 1 or 2 MC's ,by conjesting middlefield its better to attack through middle. If you have skilled and fast wingers and there is only one opp. player on each side its better to attack from sides. I know i didn't said anything briliant and these are common sence but sometimes we are all missing the obvius.