According to Alan Moore it’s better to self-publish:
Going it alone is not without its drawbacks, however. I’ve compared self-publishing to emptying a bucket of water into an ocean—who’s going to notice it? To stand any chance of success as a debut writer self-publishing, readers have to know about you via social media…which is what I’m gearing up to do in 2019.
Well-established authors do well with epublishing, as they already have a name to trade on. Many aged writers are digging out the old novels and short stories that weren’t considered fit enough to be printed thirty years ago and sticking them on their own web sites for sale.
Lawrence Block, who is one of my favourite crime writers, does this. He, and several other well-known authors such as Donald Westlake, earned a living back in the ’50s and ’60s by writing soft-core porn and pulp fiction. They used pseudonyms back then, for discretion, but are now proudly churning out their backstock in these less judgmental times.