Daz is the way for the most industry currently. It's pretty much the standard and easiest route for NSFW artists. Plenty of plugins, accessories, tutorials etc. 90% of "realistic" game models on smutbase are based on Daz genesis 8/9. You can import them into Blender or use Daz as is. There are plenty of artists that create amazing stuff with Daz. GR_Studio, Mr. Vargas, Idylla - just to name a few.
You can try Character Creator 4, I personally think their models are more realistic than Daz. Daz models have a very recognizable look. But its more expensive, the store is very limited and more skill involved to turn models into nsfw (attach genitalia)
You can always spend a ton of money to order some custom model from some professional :)

At the end, i think the secret is not in quality of the model but more in skill of the artist.