Following the exclusion of History from Academic Curriculum in Nigeria, many have issue in knowing the history of thier native land which Yoruba people are not excluded.
This trend create avenue for us all to discuss on the leading King in Yoruba land thus diving to history on the creation of kingdom they governs.
among the king that claim leadership of Yoruba race includes but not limited to;

1)Ooni of Ile-Ife
2)Alafin of Oyo
3)Oba of Benin
4)Olugbo of Ugbo
5)Oba of Eko
6)Oba of Ijebu
7)Oluwo of Iwo
8 ) Onipopo of Popo (Benin Republic)
9) Onisabe of Sabe (Benin Republic)
10) Oba of Ila
From my own perspective and my history; I'll agree with the Iku baba yeye, Alase Ekeji orisha, the Ooni of Ile-Ife (Oodua ooooo)
My own history to back this goes thus;

Odua has plenty children. first Aláàfin brothers were rulers of Benin, Ìlá, Şábę, Pòpó, Iwo and Kétu; Olufe was also part of his children being the child bore to him by his maid, but he appointed some of them to rule the sub kingdoms including some areas in Benin Republic there is Onipopo and Onisabe. But he made the last born the Oranmiyan the heir to ife throne. Oranyan was also appointed to follow the Igodomido people who came to seek the political and spiritual will from Ile Ife on getting to Uselu, he was opposed by the factioned Igodomido people and waged war against them and took over the kingdom. Then known as Ile Ibinu (Land of war or vexation), or just Ibinu, later evolved to Ibini by the people of Igodomido due to language pronouncement and to Benin by the Portuguese that came for trade . Oranyan left the throne for his son Eweka to be the Oba of Benin where he left for Ile Ife but stopped at Oyo as his palace and requested for the power in Ile Ife annexed to the Oyo empire which was so. He waged war against the Nupe and suceeded and took over the territory where he married Torosi that gave birth to Sango. Today’s Nupe is Kwara and some parts speaking Yoruba in Kogi state.
For Ijebu people were said to be migrated from Ethiopia, the Jebusites and the ojude oba people met them their but ruled over them.
Lagos was discovered by Benin’s Ado, but annexed to the Oba of Benin kingdom known as Oko (farm); but trade started there by the Portuguese with the Ado who was the minister of trade for Benin. Ado named as Ido market today and Oko is Eko. After the death of Ado, the palace was built by the Portuguese inside Isale Eko, known as Iga Idugaran.
Aushi and some town in Edo including Warri as said to have migrated from Benin.

Ooni is widely regarded as the paramount king in Yoruba land but, they are controversies over it. because of the recent claim of, ugbo people, in ilaje local government, being the aboriginal inhabitants of ile ife before the arrival of oduduwa, oduduwa and his father Lamorudu migrated from mecca following dispute on acceptance of religion and he met people in of Ugbo in Ile-Ife but conquer and rule over them.

Do the ranking of the Yoruba Obas by yourself.