Comment by technofiend

You really want 6e or 7 these days so you can shift to 6GHz. There are many more channels available, adoption is limited so there's less congestion and the signal attenuates more quickly and has higher free-space path loss as well. Sounds like you may already know all that but for anyone thinking about investing in an upgrade, the reasons listed above are why you'd want to invest in the latest tech.