I probably go to Open G the most (& it's probably the best for capo and/or slide), but really like Open C and D (DADF#AD) as well. Fahey, perhaps most notably, did "Sunflower River Blues" in Open D.
Bear in mind, however...
I think that open tunings are a trap really because it's really hard not to sound like an open tuning when your using one and that gets old as well as what you learn in one open tuning is going to stay there.
- Leo Kottke
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