Stats PP feed vs FA feed

@flightaware staff mainly

the images are from the same RPi which feeds FA directly and via PP in desktop PC.
can you please advise why the differences ?

PP appears more accurate and more far distant planes but half the traffic.

the FA is always a “normal ladder” decreasing in distance and fewer distant planes.
besides the MLAT traffic, are there positions dropped in favor of a receiver closer to aircraft ?

thanks
evangel