Soba vs. Udon. Soba is made using buckwheat flour, while udon is made with wheat flour. Buckwheat gives soba noodles a slightly nutty flavor, and, although pure buckwheat noodles are available, many varieties include wheat as well I also find they effect my body differently. I love Udon Noodles. (Check out my video on how to make Udon Noodles from scratch!) especially stir fried yum! But Soba is a...