The QWERTY design was made for typewriters to be inefficient, because, if someone typed too fast, the typewriter would jam up. Now, with computers, that design is seen by many as being obsolete and worthless, so other, more efficient layouts, like Dvorak, were made, but they are yet to achieve wide popularity.
However, due to its lack of popularity, it remains to be seen exactly how much more efficient a different layout may be.
Personally, I would stick to the standard QWERTY, just out of laziness. I already took a typing class, I’m not taking another!