I prefer calling myself an agnostic in public. The social connotations for this seem to be equivalent with a non-militant atheism, and functionally atheism and agnosticism seem to be no different. It also fits in with a more bayesian view of knowledge, where something can be improbable from an epistemic standpoint but you still allow for the possibility that it can be ontologically true. Agnosticism also implies that you're open to updating your beliefs if you acquire new knowledge, whereas atheism isn't seen that way to the general public.