I'd take Mediatek over Qualcomm for those chipsets.
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Just placed an order for the Cudy WR3000H
The TX power is set to 28 dBm, and the person selected 'China' as the country code, but they are actually in Bangladesh (BD). Does this higher dBm setting result in better coverage and stronger signal compared to stock firmware? Some people say stock firmware gives better range than OpenWRT what’s the truth?
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Set channel to 36.
Under 160MHz width, there are only two "windows", and the second one is entirely into DFS channels. Use the local country code to comply with local regulations. 28 dBm is way high, I don't even know how you can set this.
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I forgot to mention something important while reporting results : the power TX is set to 17 dBm on the router. I lower it willingly. Hence are results I displayed lately are to appreciate in consequence. Results are expected to be higher default TX power.
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what u say about this? and stock firmware maybe gives in between 21 to 23 dBm
I have never used stock firmware ... only to immediatly install OpenWrt.
So you are using the 17 dBm.Can you do the same test again by setting up your router dBm to max ? 23 and another like the photo 28 dBm just for a moment and highlight the difference.
Ok I set it up to 23 dBm
With a smartphone, 5m no obstacle -40 dBm. With 10m and 2 walls -69 dBm. This time I used the internal advanced wifi menu from the smartphone to read this. Previously it was an app.
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Can’t go wrong with Mediatek godsend TXQS/ATF/AQL wireless capabilities,
Can you check it again?
If you can then This time use https://play.google.com/store/apps/details?id=abdelrahman.wifianalyzerpro
this wifi analyzer app and tell me the dBm you get on 5Ghz.
I already performed 3 series of tests, just for you ... 
I have cudy wr3000s. I am on immortalwrt on 5ghz the range is So bad compare to you in 10m with 1 Wall and 1 wooden door. There no fridge or oven between the router and the device.
Maybe its time to get back to openwrt.
Some extra infos.
I have now a WR3000H since yesterday. It is used as an AP, connected to the network with the 2.5Gb port. The whole network is at 2.5 Gb (minus NAS, printer). File transfers from LAN to wifi can reach 170 MB/s which is rather incredible. This device is a beast !
With the WR3000S, it was reaching 105 MB/s. I was wondering if this limit was due to the wifi capabilites, or the 1Gb LAN capabilites. I have the answer now.
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