In the end it's a matter of what supports you can use here IMO. It's easier to build a party with Ozy due to how solid he is, while Kintoki requires more support due to his fragility and lack of utility as he can only provide damage. Both are great units in the end.
Of course if you want to min turn with Skadi then use Kintoki, but personally I dislike min turning CQ because it's not fun, you basically skip the challenge doing that.
Oh, I though both buffs neede the Sun field. That's nice to know, I can easily provide the stars myself, so I don't care that much about the stars x turn not triggering.