Depends what you’re doing. Firefox’s dev tools are definitely better at CSS debugging for example.

A minor quibble I have with Firefox's Dev Tools is that in Responsive Design Mode, there's no way to simply select "Fit to screen" as a Zoom level. If you're on a laptop, you'll have to scroll to see the full emulated viewport.

I think touch recognition is better on Chrome too, as sliders and other touch-sensitive UI elements feel a bit more laggy in FF.

On mobile, I'm happy using Brave, which is Chromium but allows you turn off scripts if you want to (goodbye autoplaying videos). On desktop, FF all the way. Except when I need to use Dev Tools.