Yellow Vs White Onions: Which Variety Is Sweeter? - Tasting Table
Briefly

Grocery shopping for onions involves choosing between red, yellow, and white varieties, with each type having unique benefits. White onions are noted for their mild sweetness and are ideal for raw usage in salads or dishes like pico de gallo. In contrast, yellow onions make up the bulk of U.S. production at 87%, and their strong flavor suits numerous cooked recipes. While white onions are favored for their bright taste in Mexican cuisine, yellow onions should generally be avoided when raw due to their intense pungency.
When deciding between onion varieties, white onions stand out for their sweet, mild flavor, making them ideal for raw dishes like salads or fresh pico de gallo.
Yellow onions are the most popular variety in the U.S. due to their versatility in cooking, comprising about 87% of the annual onion crop.
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