The signal in the garage is pretty weak which is only 30-40 feet from the router. I would have to say Asus had the weakest not by much and the D-link and X6 are about the same. DESIGN I know this is personal preference but I prefer the Asus, followed by the D-link and then the X6. The D-link does seem like the nicest quality.
https://www.amazon.com/D-Link-Tri-Band-Performance-Beamforming-DIR-890L/dp/B00PVD81MK