User blog comment:EggInABasket/Eggs Opinion on Smart Cast/@comment-3514681-20120509003006

That heavily depends on what you find comfortable. Some chars, like Ez, Mundo, utilize skillshots which require pinpoint accuracy and, especially early on, can decide your lane. Now early on, you have minions, which means that sometimes an opening is a split of second wide. Utilizing smart cast can help you greatly.

That being said, it is REALLY up to you. Most of the times i just use it to make myself faster, but some skills beg for traditional aiming. For example, Lulu's Q is pretty complex and you might want to see where exactly will it go, especially while mastering the champ. Also, i tend to utilize traditional aiming on ultimates so that if i should click it by mistake, i will not lose the ultimate. Just pick whatever suits you, and NEVER, but NEVER listen to an argument like "pros do that". LoL is a game, it is supposed to be fun for you, and not some kind of dick-measuring competition. Yes, i detest pro gaming.