Food processor: This is the Cuisinart 3-Cup Food Processor. A food processor is a great multi-tasker; it can shred, chop, and blend as well as puree. But it's a pain to put hot soup in a plastic food processor.
Immersion (stick) blender: This kind of blender (shown: Cuisinart SmartStick) is very convenient, since you stick straight into a pot of soup or soft potatoes and puree away. But we wonder if it's a one-trick pony; would we really use it enough to justify a purchase?
Stand blender: (Shown: the pricey, all-powerful VitaMix) A blender is like a food processor: endless uses. But it's a real pain to transfer soup; we have to cover our blender lid with a towel to keep hot soup from leaking out.
What's the verdict? How do you get smooth soups and sauces?
Related: 'Tis the Season for a Food Processor