I wouldn't outright dismiss the iClone or CC renderer. Iray is indeed very dated as it does not support the newer shaders. Plus, hardly anybody uses it.
There are still people like myself who use iClone for rendering and I will be able to judge the quality of a character and I want to know what to expect. I have been fooled in the past by props that were shown in Unreal and needed a lot of work to look acceptable in iClone.
However, as Autodidact suggests, the best external renderer (if you want to go that way) would be Omniverse as the shaders do carry over.
Now if you are aiming at a specific market whwre your character is to be used in external applications then you should provide renders so people can judge how the character looks in those applications. By following the threads decicated to those applications, I have learned that there is usually still adjustments need to make the character look good, so be aware of that.