Mainstream probably, far fewer billing hassles and other threats.
The eagerness with which i'd jump also depends on exactly what it was in "mainstream"...
I know a guy who was crazy into cars and started selling old car prints online from the 50's to the 00's at up to $100 a pop, made so much money he quit his day job.
Something like that you were passionate about? man, I wouldn't hesitate, but it all depends there would be a lot of mainstream biz more boring than this.
But then again it's a funny hypothetical in that no one would give up a successful porn biz for mainstream when they can branch out and just have both
