The performance is fine on desktop, maybe even on par with Chrome. It used to be worse but nowadays I can't see any performance difference between Firefox and Chrome on desktop.

The performance on Android is garbage though :(.

The feature set is worse in some parts, better in others. Better UI customization, container tabs is cool, and some extended APIs for extensions. Meanwhile, Chrome has support for more exotic web APIs (e.g. WebUSB, filesystem access). So it's your choice.