It depends on what you want to use it for.
A blender blends and liquefy ingredients. Think blending blueberries, milk, and ice cream together to make milkshakes. Blenders also make excellent smoothies, purees, soups, dips, and nut butters.
A food processor dices, chops, and cuts down on food prep time. Think of making breadcrumbs, slicing cabbage, and dicing vegetables.
So, if you want milkshakes, smoothies, and anything that involves blending mainly wet ingredients, go for the Best Ninja blenders.
But if you want to let a machine chop up stuff for dinner, go for a food processor.