I have made both. They both taste the same in my opinion. The biggest difference is calories! Sweet Potato has about double calories, sugar and carbs that butternut squash does. But Sweet Potato is still good for you so really use whatever you can get your hands on. The same goes for coconut milk. Light coconut milk has about 50 calories per serving and regular has 150 calories per serving. I have made it with both. and a mix do whatever suits you best!