The following chart notes which early commentators, both Jewish and Christian, held to the Angel view of the Genesis 6 affair, as I term it, and which held to other views which mostly consist of the Sethite view or misc. (such as Noblemen view, Judges view, etc.).
The date range is from 250 BC to the 5th century AD. Out of 43 texts the results are: 28: Angel view 10: Misc. views
5: uncertain
See my section on the Nephilim here as well as my section on Angels.