I play on all PMCS now, it's whereveer the fun games are.
If I'm on a PMC and we don't have enough numbers for a certain game mode then I switch accounts, sometimes it's that dead.
Honestly you steamroll in sabo in Valor, you get duckhunted and annihilated in sabo on SVER, there doesn't seem to be much difference and ultimately, no point in faction loyalty.
I am still extremely loyal to Valor, I have tried the other PMCs multiple times, but always come back to Valor. Sometimes I lone wolf, and sometimes I group up, but I always love playing on Valor.