You need XSIM if you are using Xilinx’s encrypted IP. However XSIM is very slow.
GHDL and nvc both support OSVVM well – however they need a third party waveform viewer such as SURFER.
OSVVM is updated several times each year. Even if a simulator includes an OSVVM release, it may be out of date.
OSVVM is fast to compile the project. Just start the scripts and then build $OsvvmLibraries. For all simulators except XSIM this takes less than a minute
For more on running OSVVM scripts see OsvvmLibraries/documentation
