>>23605966
PGs are basically massive MGs, at least the older ones are. Usually you get some extra gimmicks like maintenance hatches and opening parts on the armor, or in cases like the MK-II you get a crazy detail internal frame. Some kits like the PG Exia are in a league of there own though; in fact, the PG Exia is the best kit of the suit as a whole.

PGU is basically "let's cram absurd amounts of detail into this large inner frame (picrel), make the external a mostly refreshing take on the original design, and then charge hundreds of dollars for it"

PGU is quite the step above regular PG, I'm just malding over the Nu being 700 fucking dollars WITHOUT LEDs