Best router to use as wifi extender to detached garage

I need to extend my wifi to a detached building about 75 feet from my house. It cannot be hardwired. My modem/router in the house is comcast xFi advanced gateway XB6-A. I was told by a Netgear tech support person that the best option for getting the most extended range is to use a Netgear router as an extender. Which router will extend the most powerful wifi signal over the longest distance? The choices available today for me to buy at the store are: 1) Nighthawk dual-band AX 6000, 2) Nighthawk AX5400, 3) Orbi AX 4200, 4) Nighthawk dual band AX 1800 dual-band mesh. Thanks in advance for any guidance.