I'd say both
Usually, I tend to prefer one over the other and vice-versa depending on my mood..
Moreover, they're complementary and can do something the other doesn't and such. Like, let's say you have a song requiring vocals which are powerful... Soft voices can be barely made powerful (if you exclude utagrowl)... But then again, if you have another song where you need whisper or soft voices, then it will be hard to tone them down without having to smother them ^^"'
(Honestly my very big favourite would be the middle/"neutral" one as it's easier to soften them or to power them up)
Usually, I tend to prefer one over the other and vice-versa depending on my mood..
Moreover, they're complementary and can do something the other doesn't and such. Like, let's say you have a song requiring vocals which are powerful... Soft voices can be barely made powerful (if you exclude utagrowl)... But then again, if you have another song where you need whisper or soft voices, then it will be hard to tone them down without having to smother them ^^"'
(Honestly my very big favourite would be the middle/"neutral" one as it's easier to soften them or to power them up)