  We study the complete one loop contribution to H^\pm\to W^\pm V, V= Z,
\gamma, both in the Minimal Supersymmetric Standard Model (MSSM) and in the Two
Higgs Doublet Model (2HDM). We evaluate the MSSM contributions and compare them
with the 2HDM ones taking into account b\to s\gamma constraint, vacuum
stability and unitarity constraints in the case of 2HDM, as well as
experimental constraints on the MSSM and 2HDM parameters. In the MSSM, we found
that in the intermediate range of \tan\beta \la 10 and for large A_t, the
branching ratio of H^\pm \to W^{\pm} Z can be of the order 10^{-3} while the
branching ratio of H^\pm \to W^{\pm} \gamma is of the order 10^{-5}. We also
study the effects of the CP violating phases of Soft SUSY parameters and found
that they can modify the branching ratio by about one order of magnitude.
However, in the 2HDM where the Higgs sector is less constrained as compared to
the MSSM higgs sector, one can reach branching ratio of the order 10^{-2} for
both modes.
