Advanced shooting provides you with the ability to aim anywhere in the goal i.e. at any part of the goal. When you hit the shoot button, there is a reticule in the goal and you can adjust it to wherever you want to target the shot. (The reticule is the reason for the delayed shooting.) It uses a 'power-accuracy' trade-off. So, more the power less the accuracy (bigger the reticule) and vice-versa.
To see the nuances of the three types of shots, take a look at the command list>shooting and give all three of the a try in the manual training. Choose the one that suits you the most.
I would also recommend putting time into practicing so that you can tap the button just enough to roll the shots along the ground (the power on the power bar should be really really miniscule). It is practically the best thing whenever one-on-one with the keeper, Aim at a bottom corner and hit with the least power you can because when you hit it low, the keeper finds it harder to save.
