The ACOG really stands out in terms of durability, clarity, and weight. Once it's zeroed, you don't have to mess with any dials, diopters, or focus adjustments, and you can rely on its simple BDC with just a few numbers to remember.
On the other hand, LPVOs offer more precision, greater eye relief, a wider range of zoom options, and a variety of reticles to choose from. However, this comes at the cost of durability, weight, size, and added complexity.
If you're looking to streamline your rifle setup and don't need anything between 1x and 3-4x magnification, then the ACOG with an RMR is the way to go. It's really that straightforward.