Basically the choice comes down to a Vitamix or a Blendtec for the BEST of the best.
The advantage with a Vitamix is that it comes with a 'plunger' that goes through the lid and lets you push down the food while it's blending, for ease of mixing. The Vita-Prep has a turn dial in the center, allowing you to control the speed from 0-10...a feature we like very much.
The blend-tec is slightly more powerful than the Vitamix and has a wider base, meaning it's a little easier to get stuff out of the bottom of it. It also has pre-set features so you can step away from the blender as it’s going and it will slowly raise the speed and lower it again, going through a complete cycle --- while all you had to do was push one button!