Really depends on your hardware. Firefox still has really shitty resource management on linux, it micro-stutters constantly on my laptop, that's why I use chrome.

On a somewhat powerful PC it shouldn't really matter though - never had problems on my desktop at least

>Any reason to use Chrome over it?
"Muh privacy" and gui customization. However, if you only care about stability and speed, use chrome.

>And what fork of Firefox is the best?
64bit default. All forks are either not worth it feature-wise or are outdated to some degree.

I would use chromium if it respected font config. Fonts look like crap.

It still sucks