The final push to start using Firefox over Chrome on Android might finally be thanks to the enormous selection of add-ons (Firefox’s version of extensions) coming out next month. Chrome doesn’t offer native support for extensions in its mobile app. Also, better security.
Chromium based browsers on Android always have been more snappy than FF. That said I have primarily used FF for around a year and it is alright. Whenever something does not behave well, I use Vivaldi.