[cadcam]

I truly think that you should call both dealers and have them come show you the software say on one of your parts.

As for the windows Dos thought mastercam will be making the new leap on the new Version X.

I do not know enough about Onecnc to give a good opinon but I do know what MC can do.

Here is a thought what kind of shop are you do you do aerospace,production,2D ,3d,molds?

Do you 4th and 5 axis. this can make a diffrence.
As for me I do them all and my software has never let me down...

But really have them both come show you what they can do and if you have a file let them use that one to see how it works with it.

JM2C