Darn Tough or Farm to Feet depending on what you like in a BIFL sock. Farm to Feet has more selection, generally a narrower fit (though not by much) and doesn’t make your feet so sweaty. Darn Tough is more widely available, fits a bit wider in the toes (again, not by much) and can turn into a feeling of wearing sweaty bags in your feet. So we’re clear, both are moisture wicking. Neither are going to create an environment that encourages fungal growth. It’s all preference, especially since they have effectively the same warranty