Guru Arjan (Punjabi: [gUru @rdZ@n]; 15 April 1563 - 30 May 1606) was the first martyr of the Sikh faith and the fifth of the ten Sikh Gurus, who compiled the first official edition of the Sikh scripture called the Adi Granth, which later expanded into the Guru Granth Sahib. He was born in Goindval, in the Punjab, the youngest son of Bhai Jetha, who later became Guru Ram Das, and Mata Bhani, the daughter of Guru Amar Das. He was the first Guru in Sikhism to be born into a Sikh family. Guru Arjan led Sikhism for a quarter of a century.
Arjan had five elder brothers, Prithi,Chand and Mahadev. Guru Ram Das chose Arjan, the youngest, to succeed him as the fifth Sikh Guru. Mahadev, the middle brother chose the life of an ascetic. His choice of Arjan as successor, as throughout most of the history of Sikh Guru successions, led to disputes and internal divisions among the Sikhs. The stories in the Sikh tradition about the succession dispute around Guru Arjan are inconsistent. In one version, Prithi Chand is remembered in the Sikh tradition as vehemently opposing Guru Arjan, creating a faction Sikh community. The Sikhs following Guru Arjan called the Prithi Chand faction as Minas (literally, "scoundrels"), who are alleged to have attempted to assassinate young Hargobind, and befriended Mughal agents. However, the second version, found in alternate competing texts written by the Prithi Chand led Sikh faction contradict this version (their non-derogatory name is Miharvan Sikhs). They offer a different explanation for the attempt on Hargobind's life, and present the elder son of Guru Ram Das as devoted to his younger brother Guru Arjan. The competing texts do acknowledge disagreement, Prithi Chand leaving Amritsar, and describe him as having become the Sahib Guru after the martyrdom of Guru Arjan and disputing the succession of Guru Hargobind, the grandson of Guru Ram Das. The mainstream Sikh tradition recognised Guru Arjan as the fifth Guru, and Hargobind as the sixth Guru. Arjan, at age 18, became the fifth Guru in 1581 inheriting the title from his father. After his execution by the Officials of the Mughal Empire for attempting to hinder with the Mughal succession of ruler. After him, the Sikh Gurus were hereditary, as his son Hargobind became the sixth Guru in 1606 CE and later the title of Guru remained within the family.

Q: Who succeeded Guru Arjan ?
A: Hargobind as the sixth Guru.

Q: So who won the dispute and became the Sixth Guru ?
A: Hargobind
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The stories in the Sikh tradition about the succession dispute around Guru Arjan are inconsistent. His choice of Arjan as successor, as throughout most of the history of Sikh Guru successions, led to disputes and internal divisions among the Sikhs. The stories in the Sikh tradition about the succession dispute around Guru Arjan are inconsistent. The mainstream Sikh tradition recognised Guru Arjan as the fifth Guru, and Hargobind as the sixth Guru.
The mainstream Sikh tradition recognised Guru Arjan as the fifth Guru, and Hargobind as the sixth Guru.