the green tops are more delicate. They work well both raw and cooked, making them perfect for salads, soups, eggs, noodles, and stir-fries.
Spring onions are a bit more mature. They have a small bulb at the base, which gives them a richer, slightly sweeter onion flavor—closer to a mild red or yellow onion. Because of this, they are great for grilling or roasting whole. The bulb can be sautéed like a regular onion, while the greens still serve well as a garnish.
Chives, on the other hand, are not