Wide grip pull-UPS are a style of pull-up that uses a wider grip than normal. Some people believe that this style of pull-up is better because it gives you a stronger grip. Others believe that it is better because it is easier to do because your hands are wider apart. Some people believe that it is better because it works your entire arm.
Others believe that it is better because it engages more muscles. There are many reasons why people believe that wide grip pull-UPS are better, but the jury is still out on whether or not they are truly better.