If I had to choose I'd choose adult, for me it's converting way better. But that's probably more because I know how to build converting pages/content. Which takes time to learn
I haven't spent nearly as much time and experience in mainstream, maybe I would earn way more if I had spent that time in mainstream.
In the end hard work/ trial & error and choosing a product you have affinity with so you know what a potential customer is looking for is more important
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