This kind of threads are just silly!.. Sorry!.. but Best?!.. from which perspective and for whom(/what kind of individual you are)?.. Because, at the end of the day, objectivity won't cut it in this kind of comparisons; there is always pros and cons in everything and the call is YOURS.
So, if we believe the masses (ie. the browser market as of Nov. 2019) then Chrome would be the "best". Check the
stats at financesonline.com.
Chrome accounts for 66.22% while Firefox has 9.54% of the browser market.
What those numbers tell us?.. To me they just point to the fact that Google has succeeded in "selling" its browser to the mass, using its dominance as a Web Tech giant, in exchange of a systematic violation of their privacy (day in day out.) That's the whole story of those number. The herd mentality does the rest; Chrome being so hyped up that the common mortals just fall for it.
Now, to remove the privacy question from this equation, I'll drop any further reference to Chrome and replace it by referring to Chromium, which is the open source version of Chrome and the basis of a plethora of forks (among them
Brave browser -
Brendan Eich's new browser after his resignation from Mozilla- and Microsoft Edge.)
Chromium isn't as "sexy" as Chrome but that's the price you pay to preserve your privacy. On Linux, most distribution provides the missing parts (e.g. mp3+mp4 media support), so it should not be a problem. Otherwise,
Brave browser is a good alternative.
On purely technical grounds, Chromium and Firefox are basically the two top notch browsers out there (Safari being the third.) Their performance are roughly the same, outperforming each other in particular tasks with a slight edge for Chromium. There are many benchmarks you can consult on the Web (
those on phoronix.com came to mind.)
We should also know that the performance of each browser change over time; the general trend being that it increases but it can also decrease in versions where significant features were added without been fully optimised.
Check this benchmarking for Firefox versions.
The thing is that
software is complicated, but
human-beings are even more complicated; and
when you mixed those two, unexpected results occurs :-)
So, back to the question, Chrome vs Firefox?... Of course, Firefox!