Mikoto, because she tried to keep the family together through really tough times. The Clan was planning a coup, Itachi was drifting apart from the family, her husband was living a very stressful life and she tried her level best to be as kind as possible to all of them, as Sasuke was also going through his own troubles. And yet, she still tried to stich her family together, because this is what a good family member does; he/she tries their level best to mend the fractures. Gaara's and Naruto's mothers are a close second.
Hinata and Sakura are both a stinking heap of trash in this department. Sakura had daughter with someone who, to this day, has no interest in her and doesn't want anything to do with a second-rate family. And because of that, Sarada suffered. She never bothered to continue on with her Medic division duties and took loans and mooched on the leftovers of Uchiha money and literally destoryed Sasuke's home. It wasn't even this loopy tramp's own home! Laughable. And after a decade, the stupid ***** was still taking loans! How about getting a job to provide your kid with a better life? Nope, she doesn't care. I guess as long as people throw money in her mendicant drum to put food on the table daily whilst she dreams of Sasuke's penis at night, all is cool. She has no shame. But, I guess it's nothing new for Sakura.
Hinata does nothing to mend the bond between Burt and Naruto and stands there in Burt: The Movie looking typically stupid and clueless like she always has been. Looks like after she got Naruto's penis, the role of a mother wasn't that important. She stands around all day and does nothing and still doesn't seem to find the time to go to Naruto's office and talk to the guy. She comes across as this laughably unintelligent lump of shit who stands around like a bystander and lets the family fall apart all around her. It's funny, as Burt himself made the effort to bring the family together. She did shit. Heck, she ran off to save Naruto when things were falling. The debris could have killed her children! And she didn't she care and got knocked out like a sad little ***** off screen. Mother of the year!
Anyone who selected these two are nothing but trolls as every single one of those women there have merit. Every single one bar these two.
Because teaching your sons to be obedient little Nationalists is a top priority of motherhood.