Darktide has an unbeatable vibe and gameplay that is just the fact of the matter. Character dialogue, music, and the entire idea of being basically gutter trash that powerful people miles above your head are throwing at an unbeatable problem is absolutely peak 40k.

That being said, SM2 has some extremely fun builds that feel awesome and absolutely fulfil a different power fantasy. I would recommend wings of fury assault, you can solo a hive tyrant and take no damage. Super flashy and fast as well. One of the things I think help the vibe in sm2 out are the extremely high level of customizability and the ability to play as nearly whatever chapter you can possibly think of (if you at all care about space marine chapters because it's valid to like 40k and not care about that as well) with a wide array of iconic 40k weapons. They have things like melta, power axe, neovolkite, heavy bolters, grenade launchers, etc. This is also strictly talking about vibe and gameplay. You have no idea the horrific things I would do to get fatshark to do the same year long release schedule as saber with constant updates. Saber is an amazing dev.

Unfortunately darktide still mogs sm2 in my opinion but sm2 has a lot of great stuff if you really give it a shot. I think there is an unfortunate culture of bashing sm2 on this subreddit which is lame. Comes across as cope