I'm a fan of Miko Haniu, but I think right now I'd vote Yukari.
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I also don't think it is fair to compare Shuna to Shuri, they have a similar body but Shuna was never as prolific as Shuri has been so far. Shuri went right to the big studios too, whereas Shuna worked mainly with certain loli centric studios first and I think that shaped her career/performances.
I think there is a "hardcore loli circuit" usually debuting with Shishunki, First Star, or Minimum and then sticking with them as well as KTK_/Gentlemen and other small studios. This seems like the fast track in terms of quality releases, and they often push the girls' limits in terms of sex/acts. Then there is a more mainstream market for girls like Shuri who don't always act under loli, like Mikako Abe too. They sometimes have good movies and often eventually do work with the other studios. But there is too much filler work, and it just keeps me from being a loyal fan anticipating every release.
Shiina Sky is even worse in that sense, but even as I complain I know that eventually I'll enjoy them again once I stop taking them for granted due to the overexposure. Plus when doing that many movies per month after a point they seem like they are just going through the motions. All lolis should get paid vacations to Thailand like Yukari did.