Best MiniPCIe Wireless Cards for Custom AP

On my Turris Omnia, I am using Mikrotik R11e-5HacT for 5ghz and R11e-2HPnD for 2.4ghz.

These are high end cards and very expensive. But they work fairly well. The 5ghz one is unfortunately susceptible to firmware bugs like all the other QCA9880 units. Hope this helps.