Comment by least

I could be entirely off base, but I would expect Android to be more likely to have more users that would go out of their way to use a non-default web browser, given that it seems to be favored by people who like customizing things. The relative openness of the platform invites a different demographic.

On the other hand, the default on Android is Chrome so there may be less motivation to change since it's the 'default' platform to target. But if Apple opened up iOS to other browsers, the likely outcome would not be Firefox gaining market share but Chrome completely taking over.

I do not like that iOS doesn't allow for alternative engines but I appreciate that it's basically the only thing that even somewhat reigns Google in.