Vitamix Ascent X4 Blender vs Blendtec Designer 650 Blender

Buy the Vitamix Ascent X4 if you want a smaller jar, guided programs and the longest warranty in the class. Buy the Blendtec Designer 650 if you blend for a family, want a bigger jar and a lighter machine. The Vitamix has a 10-year full warranty and a 1,500-watt motor; the Blendtec has a 3.0-peak-horsepower motor, a 90-ounce WildSide+ jar and a touchscreen. Owners of both praise motor strength and thick blends; the common complaints are the Vitamix's 48-ounce jar filling fast and the Blendtec's blunt blade needing more liquid in dry mixes.

• Choose the Vitamix Ascent X4 if you blend smaller batches, want five automatic programs plus a self-clean cycle, and value a 10-year full warranty.
• Choose the Blendtec Designer 650 if you make large batches for a family, want a bigger jar and a lighter machine, and like a touchscreen with six programs.