I switched to Google Chrome when it came out (14 years ago according to Wikipedia) and to Chromium when I got sufficiently annoyed by Google. In August I switched back to Firefox. Here are some thoughts:

- the experience is 90% the same. - Sync between Android app and desktop is just as flawless (that one made me switch back to Chromium on my first try a few years ago) - Theming is nicer - switching between home and work profile is great with the profile switcher extension - Firefox seems less well integrated into many websites. I keep entering my credit card info on many sites, because the option to use saved cards either does not appear or does not work. Same is true for suggesting passwords. So I use keepass' for both now (which might be good) -the developer tools are a little annoying. I use them mainly for Web scraping and sometimes I give up and copy the curl call from Chromium because the formatting is nicer and the network tab looks cleaner

I won't switch back to Chrome and miss it less and less. Only during black Friday and when I taught my webscraping course I missed Chromium a little.