If you don't hate front-end period now, mobile's a hell of a lot easier and I think it still pays better than front-end webdev for some reason. As long as you stay away from the web-tech-on-mobile crap and write actual native code. It's especially easier if you specialize in one of the Big Two, but even working on both isn't that bad. I mean, it's not JS "culture" bad.
iOS is far and away the saner of the two if you wanna pick just one, plus it's an easy gateway to the whole Apple family of devices (watch, TV) including, soon, macOS itself. Android's broadly less pleasant and any devices outside phones that happen to be running it are likely to be batshit insane to work on, but it's still way better than the web, and a ton better than it was back in the 4.x days (let alone the 2.x/3.x split days—oof, it was hot garbage back then)
I don't quite understand this. Since 2013 React has remained a JS framework and introduced 1 new concept(hooks). iOS programming on the other hand(since 2013) has introduced a new language(Swift) and a new paradigm (Swift UI) for writing interfaces. All to target around 25% of the mobile market.
iOS is far and away the saner of the two if you wanna pick just one, plus it's an easy gateway to the whole Apple family of devices (watch, TV) including, soon, macOS itself. Android's broadly less pleasant and any devices outside phones that happen to be running it are likely to be batshit insane to work on, but it's still way better than the web, and a ton better than it was back in the 4.x days (let alone the 2.x/3.x split days—oof, it was hot garbage back then)