RTX does not exist any more. It was discontinued one or two LabVIEW version ago.
ETS works pretty well. It just has the disadvantage of needing a second computer.
Do you really need realtime? A modern multicore PC can handle quite a bit of processing, and the Windows latency is pretty small. I think with multicore it is even less likely to interrupt a critical process, since Windows will only tie up one of the CPUs. Unless you are doing control with critical timing, I don't usually see a need for realtime.
Bruce
Bruce Ammons
Ammons Engineering