This all depends on your application. The Litebeam 120 works well with a couple of camera sites. In most situations, for short dstances, maybe 1500 max, which is most applications, I use the nanobeam ac 19. The nanobeam ac 16 is junk. For a PTP, a pair of 19s work well. In most cases with many camera sites, I use the Rocket Prism with sector as the AP with a sector and a mix of the Beams and Grid forms for the client, depending on distance. The Prism with an omni also works well in a centralized location, where there is not much interference.
I have always liked the nanostation radios with rocket radios as an AP because they had dual NICs, good for two cameras and easy relays. i wish the nanobeam 19s came with dual NICs to eliminate the need for an external switch. Most remote sites, I have found, have either dual cameras or relay to another site.