The place that I work has pre-e and master cam both. I am not impressed with the cam side of pro-e. the programer tried to get good tool paths and did most of the time. but it took a lot of time. So we looked at master cam to do 2d parts in the shop. We got a 30 day evaluation. In that 30 days the guy in the shop ( with out any experience with master cam or 3d programming ) was programming all the parts 2d and 3d. Now we use pro-e to design with and master cam to machine with.
Is master cam better than pro-e? NO! Was it better for us? Yes.
It let the designer do the desinging and the shop do the machine programming.
For us master cam was better for machining Than pro-e.