Tsubaki is HELLO, as in you've just met them and still have some work to improve, but Kobushi is PRO, as in they're so good already, it's no problem, all professional

Though, that being said, aside from my super interest in pretty much all Kobushi members and the whole group in general, I still find Tsubaki interesting in their own way. Kiki's charisma, Kisora's cuteness, Ami's awkwardness, Kishimon's expressions is so far what I see, and the other 2 don't seem so bad as performers, and there's barely anything of them we've seen.
Kobushi's performance of Nen ni wa Nen though, all that energy, expressions, and singing with emotion, it's a rockin' song and it was definitely an uplifting performance, as in, you'd get pumped up watching them perform it.