See over here: Acker, F. (2008). New findings on unconscious versus conscious thought in decision making: additional empirical data and meta-analysis. Judgment and Decision Making, 3(4), 292-303.
From the abstract: “[…] there is little evidence for an advantage to normative decision making using unconscious thought. However, a discussion of potential moderators shows that further study would help to identify situations in which unconscious thought is truly helpful and those in which it is not.”
Hints of individual differences! How cool!
See also here.