There is no doubt about the performances of both the blenders, they both have same watt output of 900 watt. If you are looking a model with more power you should check Ninja BL455 with 1000 watt or Nutribullet Rx with 1700 watt. If you need lesser power and little cheaper model you can check Original Nutribullet 600 watt or Magic Bullet with 250 watt.
Both the models are single server. The RPM of Nutribullet (25,000) is more than Nutri Ninja (21,000). Considering the jar capacities and number of jars, Nutribullet is ahead of Nutri Ninja. The one difference which is most important is the extra extractor blade. If you are high on smoothies and drink it everyday, the extractor blade will wear out soon. Nutribullet 900 Pro series comes with an extra extractor blade. This feature is specific to this model only, the other model Nutribullet Rx does not have this feature. Overall, both these models are sleek and compact.
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