I feel compelled to comment that it is as reasonable to compare Tormach's new system to MACH4 as it is to compare stepper motors and servo motors . . and the same useless arguments would abound.
MAch4 is specifically designed to be extensible and allow users and developers access to the data and resources to use MACH as a base for not only routine CNC, but many other specialty applications.
Tormach, following their well documented edict of preventing users form even changing a single parameter, has done little more (from where I am viewing, and I have read all of their published propaganda on this new toy) than taken one of many thousands of public domain softwares and modified it and if you buy the official spin, 'improved' it greatly. However, unlike most who engage in the intended spirit of public domain software, Tormach's modifications are not shared with the community from whence their 'invention' actually came, but have added self serving features specifically designed and intended to keep (exclusively) their own users out and reduce their support load by restricting what users can do with their own machines.
It took me 5 minutes to get into Tormach's 'locked' MACH3. Now perhaps they will be more successful at dictating what their users may and may not do, especially if they are successful in propagating the new master into the existing field. Pilot is a means to an end.
With such vastly different objectives, making a direct comparison is akin to comparing a cow to an acorn.
Your mileage may vary . . . .