Channel noise energy estimation


I was using the radio module DW1000 to communicate with different devices, than I was wondering how to understand on which channel it is better to TX/RX the data.
On the reference manual i found the register AGC_CTRL1 (precisely the sub-register AGC_STAT1) that combine EDG1 and EDV2 values to get a noise energy level referred to the configured channel

I thought this noise level should be what I need to determinate which channel is better, so I followed the procedure described.

The doubt I still have is how to correctly interpret/test these levels and if they are actually the best solution to solve my problem.

Thanks in advance

These are the registers and procedures I refer to: