Thanks, I wanted to know the difference with COSMIC

I wouldn't be surprised if the COSMIC folks add it after the 1.0 release. There's been a lot of feature requests for it. In the mean time, a System76 employee created this unofficial extension to let you use other compositors within COSMIC, including Niri.

https://github.com/Drakulix/cosmic-ext-extra-sessions

Cosmic with tiling would be so incredible. I love cosmic and that's the one thing I'm missing

cosmic has tiling! that's the main reason i'm using it

I also switched from PaperWM to niri, and I was reluctant to do it, because I really liked not having to configure several different little apps to get a working desktop environment. GNOME comes out of the box with an app launcher, a basic configuration editor, a screen locker, widgets for controlling audio and network, etc. But ultimately, PaperWM was too quirky. For example, sometimes PaperWM and an app would disagree about what size the app's window should be, and the window would resize itself repeatedly. The vertical sizing never worked very well either.

I'm in a similar situation; I think QuickShell [1] could be a compelling option, particularly premade configs for it like DankMaterialShell [2] (which is intended for Niri).

[1] https://quickshell.org/

[2] https://github.com/AvengeMedia/DankMaterialShell

I've been very happy with Noctalia. https://github.com/noctalia-dev/noctalia-shell