Nice quote from a recent online article The article is recent (Oct 20). The quote might be dated, but perhaps is even more valid today.
"H2S prodrugs versus NO prodrugs
Sparatore et al., after working for many years with both NO- and H2S-releasing derivatives of established drugs, have stated that “In the past, we worked for ∼15 years with NO donors, with hundreds of publications and patents, and we can say that H2S and the H2S-releasing drug hybrids are something beyond, and represent a significant technology advancement from, NO-donating hybrids."