The wheels in the second picture look like they are considerably sturdier relative to the loadbearing requirements.
Center of mass in the second image is also clearly inside the hemisphere defined by the wheel support points, so stability is going to be markedly better. The device in the first image is going to invert catastrophically the first time it hits a discontinuity in the travel surface.
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Center of mass in the second image is also clearly inside the hemisphere defined by the wheel support points, so stability is going to be markedly better. The device in the first image is going to invert catastrophically the first time it hits a discontinuity in the travel surface.
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