Fx radar is doppler radar but battery powered so portable.

Doppler caused issues when the FX was first brought out and can be position fussy.

LMBR uses IR beams so less light source sensitive like a lot of vane based chronos are confused by sun, cloud, electric, fluorescent etc.

I am not sure if LMBR is battery powered but if it was me, for a club/comp rig, I would look at LMBR.

I have just bought an FX but I still have a Combro but isnt ALL GUN friendly. Fx and combro need to be gun mounted or can be position sensitive.