The Quraan is three in one and True Hadeeth Qudsi as well:
1> Word (Kalaam) of Allah
2> Hadeeth of Prophet Muhammad (Peace-Be-Upon-Him), since we got from his mouth
3> Sunnah of Prophet Muhammad (Peace-Be-Upon-Him), since he himself fully 100% practiced on it.

Prophet Muhammad (Peace-Be-Upon-Him) said, BEST among you are those who Learns and Teaches QURAAN, (Bukhari_Vol_6_Book_61_Hadeeth_ 545). We must TRY to become the BEST OF BEST by Learning and Teaching the Quraan.

Quraan is the most beautiful HADEETH:

Allah has revealed the most beautiful HADEETH in the form of a Book, consistent with itself, (yet) repeating (its teaching in various aspects): the skins of those who fear their Lord tremble thereat; then their skins and their hearts do soften to the celebration of Allah's praises. Such is the guidance of Allah: He guides there with whom He pleases, but such as Allah leaves to stray, can have none to guide, (Al_Quraan_039.023).

Quraan is not a fabricated HADEETH:

There is, in their stories, instruction for men endued with understanding. It is not a fabricated HADEETH, but a confirmation of what went before it, a detailed exposition of, (Al_Quraan_012.111).

Whose HADEETH can be truer than Allah’s?

Allah! There is no Allah save Him. He gathered you all unto a Day of Resurrection whereof there is no doubt. Whose Hadeeth is truer than Allah’s, (Al_Quraan_004.087)?

Then in what HADEETH after this will they believe?

Do they see nothing in the government of the heavens and the earth and all that Allah hath created? (Do they not see) that it may well be that their terms are nigh drawing to an end? In what HADEETH after this will they then believe, (Al_Quraan_007.185)?

Such are the Signs of Allah, which We rehearse to thee in Truth; then in what HADEETH will they believe after Allah and His Signs, (Al_Quraan_045.006)?

Then what HADEETH, after that, will they believe in, (Al_Quraan_077.050)?

Those who purchase LAHWAL HADEETH, will get Humiliating Penalty:

But there are, among men, those who purchase LAHWAL HADEETH, without knowledge, to mislead (men) from the Path of Allah and throw ridicule (on the Path): for such there will be a Humiliating Penalty.  all things, and a guide and a mercy to any such as believe, (Al_Quraan_031.006).

IF QURAAN CANNOT CONVINCE YOU NOTHING WILL:

Question: Which of the three FAREWELL SERMONS is authentic? Remember: Only one can be true at a time.

01>    “I am leaving for you two things that you must uphold, the Quraan and my Sunnah” (according to Muwatta 46/3).

02>    “I am leaving for you the Quraan and my relatives (Ahl Al bayt)” (according to Muslim 44/4, Nu 2408; Ibn Hanbal 4/366; Darimi 23/1, Nu 3319).

03>    “I am leaving for you the Quraan alone; you shall uphold it” (according to Muslim 15/9, Nu 1218; Ibn majah 25/84, Nu 3074; Abu Dawud 11/56, Nu 1905).