koralays :
which one is best for ping. I m not gonna use any ethernet ports all reseved so which ones provide better lactency for gaming via wifi. The characteristics of these products are very different from each other. So i coudln't decided yet which one is right for me. Btw i m planing to connect with my asus ac68u usb wifi adapter. Thank you in advance.
All you can say for sure is which router has higher transmit power, and
might retain higher modulation with far-off connected devices. Latency is a function of distance so that doesn't change (electromechanical waves travel at the same speed), but transmit power does differ between them. The Linksys wrt32x is the weakest at 700 milliwatts 2.4 GHz and 869 mW 5 GHz, the other two are above 970 mW on both bands. The wrt32x also has only 3 spatial streams for its 4 antennas while the others are apparently 4T4R with 4 spatial streams. I don't know which channel widths they can do but assuming they all can handle 80 MHz and don't have TurboQAM or NitroQAM, then you can expect Phy rates on 5 GHz of up to 1733.3 Mbps with the 86u and r7800 but only 1300 Mbps with the wrt32x (and apply the 40% rule to that for an estimate of average throughput at 50% duty cycle and 4 ms TDMA transmit window). But that said, the ac-68
adapter is 3x3:3 MIMO, so you might not pull the max of what the 86u or r7800 can handle.
Between the 86u and r7800 routers, I'd recommend that 86u (Asus) since you can upgrade the antennas for higher gain. Also,
https://www.smallnetbuilder.com/wireless/wireless-reviews/33158-asus-rt-ac86u-dual-band-ac2900-wireless-router-reviewed?showall=&start=2 shows the ac86u handling a bit more attenuation than the r7800 at 5 GHz (42 dB versus 39 dB). That corresponds to penetrating an extra 26 feet or maybe 2 extra drywall walls.