Minato apologists forget how he never was there when Obito was crushed beneath the rock. He sent a single Jounin after a girl who was used by Mist as a vessel. She got killed, along with Obito because of his carelessness. He was the worst senin I can think of, only topped by his own student, Kakashi. Who at the start, completely neglected Naruto and Sakura in Chunin exams arc when his training mattered the most and focused of Sasuke because of personal leanings.
Yes, Obito has extremely valid points if one looks at the sordid history of Hokages and their collosal failures as leaders to maintain equality within the village. In this department, Tsunade has strove the hardest, hence despite not being a fan of hers, I would give the award to her as the best leader. Her perseverance during Pein's attack and to protect Sasuke against the village code because of his history shows his compassion as a leader.