Firefox vs Firefox vs Firefox vs Firefox vs Firefox

I want to use Firefox, so which Firefox should I use? There are 5 options that I have seen be promoted as fast, private, and/or having good performance. These are:

1. Firefox (either configured or with BetterFox)

2. Floorp

3. Waterfox

4. Zen

5. Librewolf

Which one is best for both privacy and performance/practicality