Curious, what makes Chromium better in your opinion? I have probably just touched the surface of the dev tools on both and havenāt used any features that I would be missing on either.
It's a blank browser, has barely any "Google" specific stuff in it ready to go. It is easy to develop for, doesn't require cross language compiling (rust/c++), builds fast, easy to understand how the different parts work (at least for a browser developer it should be), has documentation, is meant to be used to develop your own browser.
Are you sure Chromium builds fast? lol, it takes my laptop with 12 cores and 64gb of ram over an hour to compile from scratch, not counting the ~20gb of git history to download (I maintain an internal build at work).