Based on my experience with both, I'd strongly recommend the full size. I had a micro where the windage knob would click when you flipped the sight up and down. It wasn't consistent either. In other words, sometimes it would move two clicks when lowering the sight, but not click back when you raised the sight. See how this can be an issue? I've heard of others having the same issue. I sent the sight back to KAC. Their response was to send me a full-size.
Industry Disclosure: LGS employee
Semper Paratus Certified AR15 Armorer