For browser biggest UI difference is tabs - they squeeze instead of scrolling. There are no plugins that can create a proper sidebar, but out of the box you can organise them into foldable groups.

Search results are noticeably better, especially for non-english and location-specific results. What's worse is image search - unlike with text you tend to get only 2-3 good, relevant results, everything else is only somewhat related. I suggest giving it a try even if you'll decide against browser switch.

Stock Chrome has a flag that activates a combined two-tab reading list + bookmarks sidebar. Brave has the same flag, but for some reason the sidebar didn't list bookmarks the last time I tried.

There are actually flags for enabling tab scrolling if you want, and tab squeeze is also adjustable via flags.

Thanks, this really helped with a major pain point I had with tab management in Brave.

UI wise the big thing for me are tab groups. They are straight crack, and the stock Chromium implementation Brave inherits probably my favourite.

Apart from that, the main thing you can't adjust via flags is Chromium's style of using separate browser profiles instead of Firefox's multiple containers within one profile/window/session.

The bigger UI differences are on mobile, where again, tab groups are crack and the implementation excellent.