With the Sims 4, many of those CC creators aren't around anymore and I've been having difficulty finding really high quality skins for the Sims 4.
So I was a big fan of Navetsea Skin for the Sims 3, literally couldn't/can't play the Sims 3 without his skins, but I was aware and played with many other non-default skins by some rather popular custom content creators.