listen the dutch is a whole forest,not one line
leningrad not sound
stonewall better for white but complicated you have diffrent ways of developing b6 Ba6 the slow and probally usless manuver Bd7 Be8 Bh5 leave the bishop on b7 maybe the best.and put a knight on e4 and try to mate white if he dose not have a knight on e5.And for white much more.But if white knows his stuff he will usally have a strategiclly winning position.
Unless I'm ill-informed, the Leningrad is totally sound. And white is a few hundreds of miles away from "a strategically winning position" in the Stonewall.
In this position white is better and black has no counterplay he can try with Qb5 but it's leads nowhere the win is just techiqe.The stonewall white just has to play e3 Bd3 0-0 b3 Bb2 Nc3 Ne2 Ne5 and black cant chase the knight on e5 which stops counterplay and after Bxe5 or Nxe5 white has Nd4.
i did not say any lies and what i said about the benoni and that magnus had beaten caruana and anand with the dutch was towards a post @Mayedasun.And yes with the classic dutch black gets a position with even chance's unlike the stonewall or the leningrad.Either with the illy-genevsky system or simon williams Ne4.But black has way better things than a position that is worse for him the slav which is eqaul and a lot of white players have repeated moves int the mainline with a4 and e3,or forced a draw after a4 Ne5 Nf7.Or the grunfeeld where there are lines which after 30 moves of theory are found out to be drawn.Or the nimzo with the same story as the slav