Having recently acquired the AD&D core rulebooks, I would like to soon run an AD&D adventure, and am interested to do so the ''Gygax way'', starting with character creation. For that matter, I would like to know, what were Gygax's known character creation methods and preferences?
Gygax could be very cagey about questions like this and would give answers such as this one.
But my impression of reading his comments, and sometimes communicating with him directly was that he didn't really stick to any one method and let players choose how to generate characters from the options listed in DMG and others he deemed "not cheating".
Both he and Frank Mentzer often said that ability scores neither saved stupid players (if high) nor damned clever ones (if not).
Generally speaking, Gygax made very little reference to the RAW when actually running a game from the reports I've seen.