I use a DGX spark, with Cosmic as my DE, and it's super awesome.

This is a bit of a franekin-distro, as it's ubuntu + nvdia packgages + system 76 packages, but it works pretty well.

I've been using Flatpack chromium, which is ok for most things. It performs a bit better than Firefox does. Having access to official Chrome will be nice though, as it should come with Widevine support. Chromium doesn't support DRM, so some things like Netflix don't work.