After my experience testing the Netgear R6100, I tend to look for details on throughput with a lot of blockage. My TPLink WDR4300, which is an N-router, gave me better throughput than the R6100 once I had a wall between me and the router, an in fact there were places I couldn't get any signal at all with the AC1200 where I had no problem with the TPLink router.
Since the Wirecutter is recommending the Netgear R6250, I found this test graph from Small Net Builder:
You can see from that diagram if you've got a 5ghz client (which you do if you have an 802.11ac card), throughput from the Asus RT-AC66U can be double that of the recommended Netgear R6250 if there's enough obstacles to cut the signal significantly. The Linksys EA6300 replicates my experience with the Netgear R6100, they had a test scenario where the throughput was zero.
What your own particular "worst case" will be depends on your usage. Part of my own problem is that I have 3 stories. My router is currently in my living room, and I spend a lot of time in my finished-attic office. In fact it's been such an issue historically that I have access points in the attic, providing alternate wifi signal. I also sometimes needed wifi out in my driveway to drive my telescope, though I haven't done that for a while due to laziness, and signal strength was an issue there as well.