Ninja Blender Duo with Auto-iQ BL642 vs UltraCrush

The Ninja Blender Duo with Auto-iQ BL642 and the Ninja UltraCrush have some similarities, but the Blender Duo with Auto-iQ offers better performance for most people. Both blenders come with a large 72-ounce pitcher and Ninja's 'Total Crushing' blade assembly, making them ideal for large portions and crushing ice, but tricky to clean since the blades are sharp and have plenty of tight spots to scrub. The Blender Duo with Auto-iQ also comes with smaller jars for single servings, making it easier and more effective to blend small amounts of tough ingredients, like kale. It's better for thick recipes like nut butter and hummus, too, since it's less prone to overheating when running for long periods. The UltraCrush is a bit quieter, however, so you may still prefer it if noise is a concern.