I think it depends on what your end goal is. Are you trying to scale and hide the pixel-ness of the original? The "ours" does pretty darn well, especially if you look at the Boo example as mentioned above.
However, if you're looking at in the case of an SNES emulator or something.. then hq4x seems like the best choice. It keeps true to the original pixel art, while appearing significantly better.
Video of Ours vs HQ4X. Ours seems to have a slight advantage to my eyes, admittedly it is a personal preference. Text has a distinct advantage on HQ4X but Mario and Yoshi look better even if less "accurate".
https://research.microsoft.com/en-us/um/people/kopf/pixelart...
However, if you're looking at in the case of an SNES emulator or something.. then hq4x seems like the best choice. It keeps true to the original pixel art, while appearing significantly better.