Best one is probably pixiv. Good moderation and site administration, it has it niches and it cares about it's artists. There are so many small things on that website that make it great. The solid stats, the fact it doesn't show the number of followers so you can have privacy and don't feel bad about yourself, the way it recommends pictures, the simple fact that the staff doens't give a fuck to all the cancer that corrupts the art scene here on the west.
You want to draw anime girls, cartoons, landscape, concept art, 3D, comics, porn, bizarre porn, western stuff, bara, furry, kemono, rape. lolicon, yaoi, trap? go for it, you have your niche and your niche will find you and none of the retards will ever find you because the they don't use tags for research as much but only recommendations and bookmarks, is ideal, so if any faggot tries to fuck with because what you draw they probably will never find you that easily, I doubt the retards that do that not even know what goes there and even if they knew there is little they can do because the staff already wised up to fags like that and don't listen to mass reports anymore unless you are big enough it would be a problem for them.
Is just perfect, perfect. I love the crusty Japanese that made that fucking website, the last bastion of artistic freedom on the internet there is not some hellhole only a few thousand use.