serum, access virus Ti , it s a bit like a mix of both to me.
i was programing a sound on the virus C dsp emulator.. then just loaded rapid as the interface is better for programing and it use not much cpu and wanted to compare the sound , rapid one sounded better on this one, dosen t mean much but it can cover some of the virus sound .
for me synth like hive, dune, massive X are not competitor, rapid has much more feature and synthesis possilbities than some of these but also sonically it s not the same caractere, rapid can have that sort of polished comercial sound , maybe the others synth too but i remember demoing when i bought rapid and enjoyed it more