Been rocking Firefox as my daily driver for several years now. I don't understand why someone would not switch to Firefox at this point, unless there's just a really strong personal preference or niche feature.
Despite Mozilla's organizational woes, Firefox remains the one true "free as in free speech" browsers out there that has remained competitive. I'm of the opinion that we need Firefox to keep the Web open.
I just like Brave as a product more, primarily. Chromium native stuff like tab groups and PWAs are nice to have, and I like profiles over containers for isolation purposes (would obviously rather have both).
Plus, and this is somewhat beside the actual browser, I like that the Brave org is toolmaking focused, vs. Mozilla's activism schtick where they say they're just fine with platforms' algorithms getting tuned to favour sources the Mozilla activist people like. That was the straw that broke the camel's back for me.
(Brave is not the only toolmaking focused org - see eg. Vivaldi. Both companies, insofar as they have politics, have politics of user control and privacy and leave the other stuff at the door, and it shows even in their marketing copy being more straightforward and less slimy than Mozilla's modern output)
Despite Mozilla's organizational woes, Firefox remains the one true "free as in free speech" browsers out there that has remained competitive. I'm of the opinion that we need Firefox to keep the Web open.