Hummus is best made in a blender. Smooth and fluffy. Also a blender is good for making nut butters. I use the 710 ML bullet on my Ninja and a can of chickpeas with just a little of the liquid as the base for hummus (plus lemon, garlic, olive oil, etc.). I have to puree all my husband's food so it gets used almost daily and it's holding up well. Noisy though.

A food processor is best for things like chimichurri or pesto, where you want to keep a little texture. And of course all the other things it can do. I have one but it isn't especially good, I've had better.