Ask me my favorite flavor of D&D and without hesitation I'll tell you "Swords & Wizardry." I like them all up to 2e as well as the various clones (and 5e is certainly playable) but S&W is the version that plays the smoothest for me.
Ask me my favorite flavor of Basic Roleplaying, the system that powers everything from CoC, RuneQuest, Legend, Elric and so much more and I'll tell you "OpenQuest." It doesn't overwhelm and works pretty well will adventures and settings from the various other flavors of Basic Roleplaying.
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