Tenda ac10 has no openwrt support and i need it so i choose c6 ....bought archer c6 on 3rd august from nehru place , new delhi for 2k rs . initially router was freezing every 4-5 hours and required a reboot. turned off ''nat boost'' and it is working fine since then.
i use xperia z1 so on 2.4ghz i get only 40Mbps but on 5ghz i get full 75Mbps.
TP-Link offers 3 years warranty and i have had good rma experience in the past so went with it.
you can look into tenda ac10 router. it is also a good product.