Quran and Hadiths

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Some muslims believe that all hadiths are unreliable because its written long after muhammed.
Well, it's a valid argument but, that means you agree that old sources may be corrupted or lost. They claim that we should rely on quran only. But what is the difference between the two?

Al-Bukhari is the main source and most trusted hadith collecter among muslim world. He lived in 8th century and finished collecting hadiths around 846 and he is oldest hadith collector I know.
Muhammed died in 632. So hadiths were started being collected properly long after muhammed's time. And, yes that makes hadiths unreliable sources. But what about quran? What is the date of oldest quran in the world?
Oldest quran scriptures is in samarkand(today known as Taschkent) Muslims claim that this was one of caliph uthman's(656CE) copy, the one who produced multiple copies of quran. But, science disagree...

2nd century hijra or 8th century CE.
Shebunin dated this manuscript to the early second century hijra. On the basis of the orthography as observed in the 1905 facsimile edition prepared by S. I. Pisarev, Jeffery dated it to the early ninth century. More recently, Déroche had assigned a date to the second half of the eight century. The carbon-dating of a folio from this manuscript was carried out at Oxford. The result showed a 68% probability of a date between 640 CE and 765 CE, and a 95% probability of a date between 595 CE and 855 CE. Commenting on this result, Rezvan noted that the paleographic dating of this manuscript also indicated a date at the turn of the eight / ninth century CE.

Although the dates generated by the radiocarbon dating at either confidence level do not rule out the possibility that this manuscript was produced in ʿUthmān's time, palaeographic studies suggest an 8th century

http://www.islamic-awareness.org/Quran/T...rqand.html

So, oldest quran we have is dated 8th century. Oldest hadith collections date is also 8th century. If you believe that hadiths are not reliable then you shouldn't believe quran is reliable either.