I'm torn between those three routers in the topic title - first 3 positions from:
I already bought Belkin RT3200 (supposedly identical hardware as Linksys E8450) when I realized it does not support AX on 2.4GHz band. (I thought that was one of the traits of AX, simultaneous usage of both bands). What do you think about this, can this be an issue?
I need to decide between Asus RT-AX53U, Cudy X6 and Belkin RT3200. Which one of those 3 would you choose?
I'd like to pair it with TP-Link Archer C6 v3.2 as a second AP (on the upper floor)
Can different wifi standards cause issues here (AC vs AX)?
I prefer to make sure 5 GHz coverage is sufficient so I don't need to enable 2,4 GHz, but that is largely a personal preference - apart from the latter being too crowded anyway. Some IoT stuff might probably need it, but that depends on whether you got that stuff in the first place of course.
You shouldn't worry about AC and AX, there should be backward compatibility and coexistence in the standard, just like with N.
Stuff like BSS colouring might be helpful in crowded networks though but that's AX only.
As router, the rt3200 will be much better - in the very targetted AP use case, the ax53u/ x6 may play their cards on 2.4 GHz (however only with 2.4 GHz 802.11ax clients - and if not using DBDC, which drops you down to 2x2+2x2); all the typical 2.4 GHz mentioned by Borromini apply (and especially IoT devices are usually 802.11n at best, if at all).
Guilty as charged
...although there already is early OpenWrt support in master for the BPi r3 - but with case, PSU, 8 pigtails and 8 antennas, the price almost doubles. Great devboard, a lot of potential, but in the end just too expensive and cumbersome (getting good pigtails and 5/ 6 GHz antennas in single digit quantities without the ability to measure their performance and testing against other alternatives is not easy).
These MT7621 based ax routers depend on very tight firmware optimization to work with such a weak CPU. In more general applications of OpenWrt, the MT7621 won't have the horsepower to push triple digit speeds that ax is capable of. The MT7622 is a lot more CPU.
True but it's one of most supported platforms of OpenWRT. I'm rocking MR1800X (MR70X) mt7621da +7915d on OpenWrt since 11.2021 .It can reach 150Mbit with SQM and 1/1Gbit with hardware offload . And with price <$30 USD in my local currency You can't beat that