1. Different regions of origin: Riesling is a grape variety produced in the Rhine Valley region of Germany, while Chardonnay is a grape variety produced in the Burgundy region of France.
2. Wine styles are different: Riesling wines usually have fresh, floral and citrus flavors, sometimes with some sweetness. Chardonnay wines, on the other hand, have a variety of styles, often showing flavors of citrus, apple, pomegranate and peach.
3. Different vinification: Riesling wines are usually vinified as a single variety, while Chardonnay is usually blended with other varieties, such as with the Roussanne or Viognier varieties.
4. The production is different: the global production of Riesling is relatively small, while Chardonnay is one of the most common grape varieties in the world, and its production is relatively high.