Well that's debatable. The technology of chrome (better sandboxing) is an advantage.

I've alternated between Chromium and Firefox. Some sites seem to work better in one browser or the other.

I think the parent comment was because Chrome does its own user tracking and reporting to Google.

What exactly does it do?

I've re-read their whitepaper and while there is some data one may consider sensitive, it's not something like "user tracking and reporting" beyond the performance metrics and search suggestions (which all other major browsers do as well). There are optional features which may result in private data being sent to Google, e.g. keeping history with Google without local encryption - but you have to opt-in, which feels OK to me.

https://www.google.com/chrome/browser/privacy/whitepaper.htm...

I think using Chromium makes sense when sites have a preference, and there are attempts to remove the Google tracking from the core of the project:

https://github.com/Eloston/ungoogled-chromium/releases