Mobile is better, because you can install uBlock. As far as I'm aware Chrome mobile still doesn't allow addons.
As for FF on the main browser, they really shot themselves in the foot years ago and left a bad taste in any users' mouths. I see this same message in every HN FF update thread (since quantum). They really did fix most of the bugs and speed, but it is hard to build the brand back. The only performance/bug I sometimes get is if I'm doing a heavy research day and open a metric ton of tabs (>100) and things get pushed into swap and don't release, even after closing FF. But Chrome was always a memory hog as well so it isn't enough to cause me to switch over and this is a niche thing (and easy to resolve).