But was the code they wrote substantially identical to yours? Was what they claimed credit for your work just modified, or did they write an entirely new port that only bears resemblance?

If its the latter, you got the exact amount of credit you deserved. I’m not going to argue that their conduct was professional (though, neither was yours), but they don’t have any obligation to credit you further.

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When I was looking a couple years ago Ubuntu Touch was by far the most developed and stable. Primarily because Canonical poured millions of dollars into its development before giving it up and dropping it, but the community has gone a long way to make it what it is today.

Probably not a popular choice on this community though.

I’m pretty happy using Ubuntu. Its got a decent UI and works well enough with little fuss. As much as I enjoy tinkering, I use my Ubuntu machines for work and I really only need something simple that works out of the box.