Seems to me that there is only a pawn difference between these variations and I have noticed that many players play both a6 and g6 one after the other anyway. Not sure what the crucial differences are. I tend to prefer the najdorf but only because I am more familiar with it but then I usually play white in this position so it probably doesn't matter for me.
Sicilian: Dragon Variation vs. Najdorf Variation
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These two variations are very popular so which do you prefer? This is the Dragon Variation:
This is the Najdorf Variation: