Visual Mill vs. MACH1

I'm a little confused by the type of software that I should be
looking at for the Bridgeport I'm converting. Based on some of the
discussions on the group, I downloaded the demo versions of Visual
Mill and MACH1. They seem to be a couple of orders of magnitude
different in complexity and capability. Both seem to have
capabilities the other doesn't. I'd like to work in Windows. I also
have access to AutoDesk Mechanical Desktop amnd AutoDesk Inventor.
Would these packages be of use? (No point in learning them if they
are not as good as some other solution).

Thanks for all your help.

Regards,
Jeff