This lacks hindsight. Whatever you subjectively dislike about Reddit will certainly apply here, if not today then tomorrow. If you want proof, check out Slashdot.

Also, no porn on /r/haskell.

Open a new account on both platforms and tell me what you see. Let a 12 years old browse both platform and tell me how they behave, how long they browse, what they look at

Where are the ads on hackernews ? The fake posts which are onlyfan hooks ? The images/videos ? The infinite scroll? &c.

I do not see any of that on Reddit either. In fact the overlap between Reddit and HNs frontpages is striking (without an account). Are you sure you are looking at the same front-page?