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Which of the two is best for the home I know that x4s version has a faster processor and double the band witdh on the 5 ghz ac band. However does that alone different really matter in a 1100 square house with only a wireless printer, wireless ac laptop ac1300 top wifi speed on the 5ghz band, and wired desk with a gigabot nic. I do not see the r8000 or bigger as the right router may be the r7800 series. I have spectrum (BRIGHT HOUSE) and speed test shows 72.6 to73.4 mbit download and around 6 mbit upload and the modem is an Arriss tcg862g as we have their phone service as well.
While the R6400 will probably be fine, I have a soft spot for the R7000. The R7000 has really good third party firmware support should you ever decide to go that route.
For your situation, I would say that the X4S is not worth it. Most devices don't support 160 MHz channels. And the faster processor is not really worth it.
Even the X4 is also of questionable value. There are virtually no quad-stream Wi-Fi devices. Most devices are single-, dual- or triple-stream. Therefore, you will be unable to take advantage of the 1733 Mbps link speed.
The R7000 is an older but still a great router. It should handle your 1000 sq ft house with no problem, provided the walls are not made out of concrete, brick or lath and plaster.
If this helps the house is a 1956 home and the room where the printer and computer lives is closed in carport so your going through a outside wall to reach but the wndr3400v1 can reach with it's outpower set for 521mwatts out on the 2.4 ghz band and gives a 54mbit wireless feed to the printer yes it uses dd-wrt firmware and has four 6db external antennas in place the internal ones most rooms have cat 6 lan port in the room.
While the R6400 will probably be fine, I have a soft spot for the R7000. The R7000 has really good third party firmware support should you ever decide to go that route.
71 mwatt is the rf power level than a router is limited too by the FCC right now under its rules my old wndr3400 v1 is at 521 millwatts well over the new limit with a top limit of 1000 mwatts at the radio interface level but the transmitter has its limits before it overloads and its signal to ratio noise causes problems or burns out. I beleave the the R7000 is the best choice.
I don't where you saw that limit. The FCC revised the limits for 5 GHz in 2014. The limit was increased to 1 W, except for the DFS bands, which are limited to 250 mW (section 15.407 of the FCC regulation). Link to 2014 report about the change.
