I'm referring to the aspect of audio quality and celerity. Is Hatsune Miku the only one? I haven't been able to, maybe I'm not looking hard enough. If you can help, thanks!
I would say it depends on your taste, but it's the composers who make the music, not the vocaloids themselves, (tho if a song guest popular enough there's usually covers done by other humans and voice banks)
Unless you mean 'tuning/them sounding more human' and such the way MitchieM uses miku
