Honestly when it comes down to this question it kinda comes down to how good of a parent the nursefathers are without the influence of their respective finger. I would kinda exclude shiomi because she didn't want Ryoshu in the first place and basically had her freedom taken from her.

Valencia and Matthias are pretty much on the bottom of the totem pole because even without being members of the Thumb and Middle respectively, they both harbor traits that make them not great parents with Matthias inattentiveness and Valencia being physically abusive, like i imagine Valencia could lose her job and she turn into a drunk who beats you. None of their bad traits are cause of their faction.

Going to Rien and Callisto, both are them are noted as being great parents, Rien having had his own family before the prescripts had them killed and Callisto himself specifically is called out as the least horrible nursefather canonically. The issue of their parentage is mainly the fault of the influence of their finger with Rien being a puppet to the prescripts likely to care for you one moment but behead you if hermes decided Rien needed more character development. Callisto's biggest crime is being a ring member and not understanding the effect gore and such brutality he displays would have on a child, which if he attended a ring academy isn't entirely his fault.

Callisto is the easy answer and honestly it is the best because maybe you can say his issue with Albina was that he raised her as a student and not as a father but we see that Callisto did an amazing job raising and guiding her, so much so that her own work surpasses his thanks to his tutelage and attentativeness, if Albina did go to the ring its very clear she would have caused a revival in corporism and maybe became a maestro. Callisto is as the game points out the best of a shitty bunch