From what I've heard i1profiler is basically the evolution of monaco profiler's engine, and based on my testing I believe this to be true. I never got as effortlessly nice grays in RGB with profile maker pro, so it makes sense that X-rite would continue development of the monaco engine instead after the Gretag acquisition. I use Basiccolor sometimes for specific use cases, but mostly in CMYK or with multicolor profiling, but I personally still default to i1Profiler for the vast majority of profiles I make, and definitely all the RGB ones.