I for one would have disregarded the arguement seeing as to what I expect from Hikki and BoA.Hikki surpasses BoA on vocals quite obvious,Hikki more of a singer as to BoA is more an entertainer.It depends on how you wanted to he entertained then your choice should come to you easily.But it's still only your opinion.BoA hasn't had any plastic surgery done if I recall,the girl is 19,c'mon on.That explains some of the vocal outrank as well.Hikki's voice is more mature than BoA's.And also are Utada's lyrics,but as I said,too be expected.Ppl always slap Hikki against artist that have distinct and very noticable differences(I.E.Ayumi and BoA),how about Hikki vs. Chitose Hajime?Chitose was 3rd to Hikki and Ayumi on the charts back in '01 when Traveling and H were neck and neck all year.She wrote all her albums and her song styling is original in my opinion as so Utada's.