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Quick takes on side-by-side spec battles.
Pick
Vitamix A2300
Vitamix A2300 vs Vitamix 5200
The max RPM of the A2300 looks high speed over 20,000 RPM, way faster than the 5200's top range.
Pick
Vitamix Ascent X5
Vitamix 7500 vs Vitamix Ascent X5
The warranty period on the Ascent X5 is longer which is great for peace of mind.
Pick
KitchenAid K130
Blendtec Designer 650 vs KitchenAid K130
Voltage difference is pretty clear and I think KitchenAid K130's 240 volts might fit better in certain setups but Blendtec Designer 650 runs perfectly fine on 120 volts.
Pick
Ninja Professional Blender
Nutribullet Pro 1000 vs Ninja Professional Blender
The blade types differ with Ninja having multi-tiered which ought to blend a bit more efficiently.