Who has the advantage here? Who has the advantage here? In general  whar will perform better in this scenario- 3 pawns vs. 3 pawns, or 4 pawns vs. 2 pawns?
Black is better here, but this is much more due to piece activity and coordination than to the pawn structure.

Once upon a time (i.e. a century ago), it was thought that such structures gave a big advantage in endgames for the camp with 3 pawns on the queenside - because in the long term they can create an outer passed pawn. However, this has been debunked in practice since the times of Alekhine (who would enter such endgames on either side as long as he had more activity) and in theory at least since the works of Shereshevsky (who notably analysed endgames by Capablanca and Alekhine). Many examples in (online available) chapter V of this book by Srodovsky. In a 2001 book, Glenn Flear showed that even in pawn endgames the queenside argument is not void but generally not the most important.

Here Black controls the only open file, enjoys centralised and coordinated minor pieces, is on move and has no pawn weaknesses while a2, f2 and e4 might become useful targets. wNa3 is offside, wBf3 is unprotected and restricted by its own pawn on e4, and white rooks are undeveloped.

After, say 1...Rd8 2.Rad1 Ne5 3.Be2 (or 3.Rxd6 Nxf3+ 4.Kg2 Nh4+ 5.gh4 Rxd6 -/+) Rd2, Black is clearly for choice. 1...Rd2 2.Rfd1 Ne5 3.Bg2 Rfd8 is similar.