I personally have used mull exclusively in the past, but use Fennec currently.

Commenting here just to ask others: mull has been terrible since Android 14. Is that just for me? Pages not loading at all until cache is cleared every few minutes, its been completely unusable for me so i switched.
Nothing like that on their github or nothing. Im on a pixel8/grapheneOS

Use Mull. Fennec is just debloated not hardened.

Here's a good reference from DivestOS website

Mull is better as it have all telementry collection removed and arkenfox by default.

For broken pages u can open issue on github someone might give option u need to tweak

I used both, and my experience is, that mull has better privacy features but a lot of pages are broken. I go with fennec, because of that.

Believe Mull is better strictly when it comes to Privacy. However I personally prefer Fennec as its closer to the Firefox experience.

tuta has an open source email app, have you tried it?

Mull is better in terms of privacy and security but breaks some Websites and addons

If I remember CYT does better on Fennic than Mull.

I've tried using Mull on GrapheneOS but it just crashes constantly so I went back to Firefox.

Mull is very good.

Maybe off topic but what's the issue with using standard Firefox? Also on f-droid through Fennec/FF updater.

With things as dicey as browsers, I would rather have fewer patches and a certified version. These forks never seemed very reliable to me