Coming from a Galaxy S21 (because of the green line problem/bug they have on their screens these days) and now using a OnePlus 13, I can say that there are definitely benefits to the OnePlus 13, some that override what was available in the Galaxy version. But to be totally honest, I think the Samsung Galaxy has a more robust operating system, fleshed out camera app, and of course a more populated ecosystem, accessories etc. You can find more things available for the Samsung phone.
Now that I'm using a OnePlus 13, I'm really enjoying the battery life, although I limit the charging to 80%, it's pretty insane. It is a much slimmer phone and lighter, The screen seems to be slightly better, although coming from the original Samsung S9 (I Have had Samsung's since the S7), I always thought that the s9 screen was in some way better than the S21.
I can't rave about the sound or speakers. It is snappy and fast to use and not glitchy, which is great. I'm not particularly excited about the AI compression and algorithms it uses with the photos, I've honestly been looking at the G-camera app to try to get a better option for taking pics.
One huge bonus over the Samsung is that it has the IP69 dust and water-resistant rating. I got really sick of plugging in my Samsung Galaxy and having it refused to charge because of moisture in the port.
Finally, after shutting down a lot of the bloatware, it's not as bloated as the Samsung ecosystem, and it's incredibly good value for money. I'd say I'm happy with the OnePlus 13.