Definetly Brave Girls
a few more album sales and Chi Mat Baram did better than Exids whole discography.
They also allready have more hit songs, records, commercials.
The last Pre-orders showed that Brave Girls managed to establish a proper fandom that can keep them relevant in korea.
Due to their different career and story the fans are mostly in the older range so they dont really compete with other GGs over the conventionally kpop fandom which are mostly teens/tweens. Furthermore Brave Girls didnt gain a large international fanbase so they probably wont become as big as some other GGs .
Of course we dont know if Brave Entertainment will be able to manage the Group properly. If the Gods of Kpop throw a trantrum something unpredictable and stupid like MBK with T-ara or Gfriend with Hype can allways happen.