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It's never been a better time to switch to Firefox
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
Generally, yes, but if you're in a mixed environment than Firefox makes some sense because at least for me, I want cross-browser syncing on all of the devices I use most. I have a PC for gaming and the occasional need to use a PC at work, so I keep Firefox on iOS for this type of thing, but that mostly just acts as a place to push things to from Safari.
Even if they do use the same browser engine, the feature sets may be worth it. Orion, for example, I really wanted to like and work well since you can use a lot of the desktop add ons in both the Firefox and Chrome add-on store, but it was just too buggy to daily drive.