I know some members have a RTX Titan, so they may chime in.
One thing to remember is that RTX is not supported by iClone currently, so you will not see much of a performance improvement. The 24 GB VRAM helps, but at a price of course.
I have a GTX 1080 Ti, which is still considered a very good card. I read in an article that it was a "mistake" and that Nvidia launched a better card than intended. I thought about upgrading as well, but will wait for the 3000 (Ampere) series.