Choose correct module based on nrf52832 chip

[Stas]

I have two supplier for provide me nrf52832's based modules. So I tested it and both is ok. The distance used pcb antenna almost the same (about 80m).

If I use on external antenna with gain 3dbi I got +20% previous distance, also on that board we have metal shield, also it's has 4-layers board intead of 2-layer board and tells me that because of that the impedance is better.

I need a lot of nrf52832 modules but confused which one is pick up

[Stas]

It's more important for me compare these two modules in technical part. I remind green one has 4 layers (and they said the impedance is better) against 2 layers for black one, and for there's metal shield for green board as you can see, also IPEX socket option (manage by short bridge). I'll need a lot of one of that module so it's important for me to choose correct one. The price almost the same.