This is a frequently asked question. Of course it depends on the circumstances. A doubleton lead is blind and far worse than a pointless singleton. The doubleton lead is made for one of three purposes:
a. To hope and get a 3rd round ruff.
b. To avoid other embarrassing leads whereby you cannot lead from a hand that has all the remaining high card points expecting partner to have zero points.
c. The opponents have bid 3 suits looking for a No Trump contract.