I like the pixel art better, but I think there's more to it than that. You can't just do a 1:1 translation and expect good results. (Also, it's not 1:1, the outlines are way thinner in SVG.)
With low res art, your imagination fills in the gaps. The higher the resolution, the higher the quality you need. (Vector art has infinite resolution by definition.)
Yes! I don't know why outlines in pixel art are so often screwed up when up-scaled to high DPI - it's the reason I install posy's mouse cursors on my high dpi windows machines, they look as close to the old pixel cursors as possible
With low res art, your imagination fills in the gaps. The higher the resolution, the higher the quality you need. (Vector art has infinite resolution by definition.)