I'd assume that is in reference to it's ability to take heavy usage for lengthy periods of time. It's designed for more of a 24/7 usage while the NP-1 is a higher quality device built for domestic use with it's Tegra 4 and Android Jellybean software.
When coming to electronic devices "more powerful" can take on two different meanings. Take a panini grill for example. The commercial grade could be considered more powerful in terms of it's ability to handle cooking hundreds of paninis a day, but perhaps you could own a domestic version that is "more powerful" in it's ability to cook a couple of paninis faster and better.
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