@Urmila,
Krishna is also referred to as Devaki Nandan. He gave equal importance to both mothers, because both loved him unconditionally and without end.😊
I also love both a lot, it is so hard to choose, but I've always sympathized with the suffering Devak underwent by losing six children so gruesomely to her own brother, and then being denied the childhood of her seventh and eighth, so I vote for Devaki though I love Yashoda lot too.