VFC is more realistic (safety on with hammer drop and has licensed trades) while WE is generally considered more reliable and more support available.
VFC sacrifice reliability for sake of replicating the HK416
In regards to NPAS, VFC AFAIK has one (RA-Tech) while WE has two RA-Tech (WE Open chamber NPAS, and the aluminum nozzle NPAS) as well as FG-Airsoft Aluminum front nozzle end NPAS
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