Valmiki Ramayana-2: Which one to read?

This is a sequel to : https://inselfyoga.com/page/view-discussion?id=7912

Indian Versions of Ramayana is each region, century, and language:

Other Adaptations or Ramayana works in India:

Ramayana in each Country:

This is only a trailer of main Ramayanas, there are at least 300 versions of Ramayana:

1. Ramayana in several languages
2. The local version of Ramayana (India, Tibet, South-East Asia...)
3. Adaptation of Valmiki Ramayana
4. Adaptation of Adaptation of Valmiki Ramayana (Yes, You read it right, not a typo)
5. Ramayana interpreted in each religion or sect (like Jain, Khmer, Buddhism, Kerala Muslim songs)

How do you know what you read/ heard/ saw is the Orginal Valmiki Ramayana?

How do you trace the origin of Ramayana?

Are you going to read all these adaptations of the original Valmiki Ramayana to know which is original?

Or directly read Orginal Valmiki Ramayana and anything deviating from Valmiki Ramayana is rejected as Adaptations? 

Brahma (supernatural deity, the creator of this universe) himself asked Valmiki to write Ramayana. Is there a better orgin than this? 

Source:

https://en.wikipedia.org/wiki/Versions_of_the_Ramayana

Links to Books:

Abridged Version: https://www.amazon.com/Valmikis-Ramayana-Arshia-Sattar/dp/1538113686

Full version: https://www.gutenberg.org/files/24869/24869-pdf.pdf

Postscript:

These are previous posts on Ramayana by Maddhva:

1. https://inselfyoga.com/page/view-discussion?id=7461
2. https://inselfyoga.com/page/view-discussion?id=7235
3. https://inselfyoga.com/page/view-discussion?id=4599

They give a good background on why Valmiki Ramayana is so important when compared to other authors?