What is the advantage of recrystallizing a product from a 1:1 water ethanol solution vs ethanol alone?

What is the advantage of recrystallizing a product from a 1:1 water ethanol solution vs ethanol alone?

Of course it depends on the product's solubility. If a product is very soluble in ethanol, you won't easily precipitate the product in high yield. The ethanolic solution will reduce the product's solubility, increasing the yield and hopefully, the purity as well.