Believe nothing you hear and half of what you see.
If you decide to stay with chips, I'ld go with an AEM. Regardless if you keep the 6.1 or go with an aftermarket ecm, you will need a stable wb. Aftermarket ecms require the wb. Wbs are very reliable. All modern cars have them. All aftermarket ecms have them. The information they provide is directly tied to tuning. As long as you don't run leaded fuel they will last.