Well, if you are just focusing on the element of manliness, then you would have to pick Okonkwo without a doubt. Obierika is a character who is notable to for his intelligence and wisdom and his friendship of Okonkwo even when Okonkwo has been exiled by the rest of the tribe. You might want to think of the way that Obierika questions the reasons that resulted in Okonkwo being exiled and how he supports Okonkwo through this entire time, helping practically and emotionally. It is also Obierika who gives a final tribute to Okonkwo when he leads the tribe in a ceremony of cleanliness.
If you think about Okonkwo in comparison, he is so desperate to be seen as a man that he deliberately places himself in situations that constantly show his manliness. Consider how Okonkwo deliberately involves himself in the murder of Ikemefuna, even though he didn't have to. He not only accompanies the boy, but then is involved in his murder directly:
He heard Ikemefuna cry, "My father, they have killed me!" as he ran towards him. Dazed with fear, Okonkwo drew his matchet and cut him down. He was afraid of being thought weak.
It is in Chapter Three that we begin to understand something of Okonkwo's upbringing and in particular his relationship with his father that has produced such a character as Okonkwo:
With a father like Unoka, Okonkwo did not have the start in life which many young men had. He neither inherited a barn nor a title, not even a young wife. But in spite of these disadvantages, he had begun even in his father's lifetime to lay the foundations of a prosperous future. It was slow and painful.But he threw himself into it like one possessed. And indeed he was possessed by the fear of his father's contemptible life and shameful death.
Thus we can see that Okonkwo's desperate desire to show himself as many--killing Ikemefuna, wrestling and so on--stems from how his father was not manly and a terrible fear that he might have inherited something of those characteristics. Thus, clearly the tribe would vote for Okonkwo in the situation you have outlined.