The best smoothies are of course smooth, creamy and full of fruit or vegetables or both. To achieve this ultimate pleasure you must have the best blender for smoothies, which you can find here. Look here for Hamilton Beach Blenders. Other brands are shown below.
When looking for the best blender for smoothies make sure you consider the size or capacity, the horse power or wattage, the warranty, the durability, the material used and the ease of cleaning.
I would recommend a commercial grade blender if you are going to use your blender often or need a large capacity. If you are making a smoothie for one person, an immersion blender could be used.
I would recommend the base and container be made of metal. Glass breaks, plastic cracks and picks up odors and metal is durable and does not break or crack. Metal containers are not always availble so a heavy glass can be durable and cleans well. Blades should be stainless steel and heavy. They will be breaking up ice and hard fruits and vegetables.
Look for a machine that comes apart for cleaning. Nothing is worse than having food and dairy stick to the blades and getting discovered later when you are ready to use your blender again.
Most machines come with a one-year or two-year warranty.