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It hasn't crashed for me in a very long time. IOS now (reluctantly) lets you set it as the default browser, although you'll need to hunt around the settings.

iPhone Firefox isn't really Firefox, it's still using Apple's Webkit engine (as does Chrome on iPhone).

Firefox sync works well. I have an Android so can't comment on the iphone but Firefox works well on my MacBook.

Crashes multiple times per day for me, but does not lose tabs. Love it on PC, so the sync makes me tolerate the inconvenience on my phone anyways.

Chrome is still faster on some sites, so I still have it installed and pull it out when I have a specific need. For example: Watching long videos in unfocused windows.