It is really a tough question to answer
Because choosing from them is kind of hard as they have done equally for most of the children.
Yeah sometimes it seems that Father's are doing all the hard work and Mother's are just staying home and taking care of the kids. But they both are doing their share of love and duties towards their children.
In most of the cases the conditions may differ but as most of the Parents do their best to give the best life possible to their children.
So in my point of View both the Mother and Father are the Role models for a child.