I haven't dealt with either of them. They both look amateur, and I don't think they have access to conventional distribution systems.
The erotica site looks livelier and more substantial. That's probably because it's harder to get erotica published via conventional means, so a better grade of work winds up getting published by these outfits. Erotica also speaks to more tightly focused audiences -- no naughty book ever written appeals to everyone, but to readers who are part of a book's target audience, it speaks loud and clear, and there's not an overwhelming amount of competition from mainstream publishing -- so it's easier to sell erotica online than most other kinds of fiction.