Chromium browser which still generally has a performance edge, but without some types of Google's tracking like the browser level sign in or the recent example of Google exempting themselves from clear cookies.
But is that performance difference actually important? I can accept a minor impact as a tradeoff to support a more diverse ecosystem and weaken the Google monolith just a little.
I use both quite a bit and do not notice any difference in performance. You may be able to tell via benchmarks, but real-world performance is very similar.
