  Updated predictions for the decay constants of the D, Ds, B and Bs mesons
obtained from Borel QCD sum rules for heavy-light currents are presented and
compared with the recent lattice averages performed by the Flavor Lattice
Averaging Group. An excellent agreement is obtained in the charm sector, while
some tension is observed in the bottom sector. Moreover, available lattice and
QCD sum-rule calculations of the decay constants of the vector D*, Ds*, B* and
Bs* mesons are compared. Again some tension in the bottom sector is observed.
