I at least I feel like I'm being tracked a little less by a single entity.
Every other update it destroys my containers and I have to recreate them. Or it will just stop responding to keyboard input after an update. I have to go in and disable all add-ons, restart and enable them. I get it, add-ons are hard.
I'm just afraid that if I start syncing my bookmarks etc that I do with Chrome, Firefox will destroy them someday and I'll be left spending half a day recovering.
I do want to use it more, but I also need it to just work every time.
I've used containers since Firefox 52 and this never happened to me.
[]Perhaps that will change once they nerf ad blockers.
(I mention Firefox specifically because it's the only browser that uses something other than webkit/blink, now that Edge is out)
Add tree-style tabs to that, and there's no question of which one is best to me.