At first I would chose Sakura, because she seem to be more dynamic and fun to be around, also I despise people like Hinata, passive, extremely shy and dependent. But i just
can't stand people in real life like Sakura: shallow, dumb, selfish, loud, don't know own boundaries, etc... My mother is exactly like Sakura, and i'm fed up of people like that. If I had an in law like her, probably I would fight and get annoyied around her, and with Hinata at least i would have a friendly relationship.
Both have flaws as parents: Sakura is the freaked, stressed mother who don't listen the children and scream when things are not in her way, and Hinata is the passive one dominated by her children and husband. I don't want my grandchildren be traumatized like Sarada and think their life is a nightmare, and I don't wish no one have parents like mine. So i think Hinata even with her passiveness, she's a best mother, after all. So i'll go with Hinata.
Also this:
Hinata would bore me to death.
I think i would get bored with someone so passive, and don't think i'll have much things to talk with her, but she would my son's wife after all, not mine.