Smoothies are great because they make it easy to add fresh fruit and vegetables to your diet. They can als be taken on the go and don't require a lot of cooking.
No need to wash them ahead of time!
Your greens will last longer.
Bought a whole pineapple or a bunch of greens? Wash and cut it all in one go then store in a zip-lock bag or tupperware for easy use.
It's often more affordable, requires no prep, and it lasts longer. It also makes your smoothie taste like a frozen dessert!