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I just started using it for Android the last month or so when Chrome dropped the flag feature that let you toggle dark mode for websites with system dark mode.
I have a VPN with an adblocker so that aspect of Chrome never bothered me so much. Chrome felt like it worked slightly smoother but at the end of the day a browser is a browser and Firefox does the job. (Samsung's browser is actually surpringly good for those with a Samsung device looking for a Chrome alternative)
Firefox does seem more trustworthy overall, although I've learned by now that trusting tech companies is not a sensible thing to do.
Samsung internet also does native PWA install on mobile which is something firefox cannot do.
In case you're not aware, the Samsung browser is just another Chromium fork.