Should I learn the Dutch or Czech Benoni?

I agree, every beginner should play the Queen's Gambit Declined and experience some losses until they understand the basic positional concept that bishops shouldn't be blocked in behind a wall of pawns. Once that's understood then they can move on to a better opening like the Slav.

Also the exchange variation of the Queen's Gambit Declined isn't a symmetrical structure and I've seen many d4 repertoire books recommending it. Though this variation will also teach the beginner a valuable lesson, of what the minority attack is and how easily you can drop pawns if you play an opening that allows your opponent to do this.

As for the Dutch vs Czech Benoni, I much prefer the Czech Benoni. The Dutch has always felt a bit too loose for me.

lol...

Are you like that since you were born, or it's a symptom of some rare disease?

I wasn't nitpicking. I don't believe that him choosing an opening will obviously help him.

Explain to me how him playing the same first few moves regularly and becoming comfortable making the same incorrect plans and bad moves later in these similar games will help him with his development. Explain to me how that is better than playing a variety of different logical moves to begin the game, leading to him seeing lots of different positions and thinking at every move of every game he plays.

Mainline Benoni is pretty solid. You will have your handsfull with the Dutch, Nakamura is the only top player who plays it anymore and he really doesn't much.

Learn the Czech Benoni. I have no Idea what that is, but as Mayedasun says, it's a solid opening.

Wat?

What's confusing you, SK? If you want an answer, maybe you should put more effort into your post.

Your post makes no sense.  Who suggested that he repeat incorrect plans?

You did. That is a guaranteed outcome of "picking an opening" at his level. It's something I do. It's definitely something the OP would do.

No it's not.

LOL OK

Indeed.

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.

And classical dutch witch is maybe the best and white is rarelly prapared and even if he is he only gets a small advantage.

You have a lot more things to play that are better than the dutch if you want play it.But just don't play the czech benoni white has a ton of setups that are dangerous for black it's a stupid opening

Huh? You think that Black can hope for better than that dazzling review?

mainline benoni is almost loosing after f4 and Bb5 and.You forgot carlsen last year beating anand and caruana with the dutch.

i was replying to @Mayedasun

Therefore you're refusing to defend your contradictory lies because I'm not Mayedasun? To whom you made no indication you were replying to anyway.

You are against a line for class players because a GM won with it?

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.