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I think Sora is an amazing singer but she's not perfect. She's not the most consistent vsinger. There are times when she can sing just fine and times when she sings like an angel. Sora at her peak form is unrivaled. When all stars align, I truly think she can sing most beautifully of any vsingers. Someone pointed out her high notes is a bit nasally and I have to agree but singing at high notes is a difficult feat. I don't think anyone in hololive can pull it off as well as Sora.
AZKi is more consistent than Sora but her singing is a little breathy. Aki can sometimes sing like an opera singer. I find Suisei a bit nasally but I can't deny that she's a charismatic singer. That's it. I can't speak about other vsingers that I don't listen to.