none. chromium is a google (-endorsed) product, who put their own little tracking tidbits into the chromium project. if you still want to use a chromium-based browser, i have two ‘suggestions’:
brave. renowned in the privacy community but has had a few suspicious moments, and honestly i just don’t trust their whole big-tech thing they got going on.
ungoogled-chromium. basically just the chromium browser but without the google shit in it. no extra privacy-advancing features as far as i’m aware though, and extensions don’t seem to work.
now if you really want a good browser, go for either of the following firefox-like browsers:
firefox with arkenfox user.js. firefox as you know and love it, with the arkenfox privacy tinkering. i haven’t tested it and its apparently a bit difficult to install and configure, but i’ve heard its really helpful with privacy.
librewolf. a privacy-first firefox fork developed by an independent developer and contributors, no big-tech bullshit. my personal daily driver.