Artcam Pro or Aspire

I am looking to buy cnc software that will support 4 axis machining. I am looking to do mostly complicated 3d work with pictures, and I have been looking to buy either Artcam pro or Aspire. Looking in all of the forums people seem to discuss most of the 2d to 2.5d features and benefits, but i would like to know which software has the best 3d modeling/machining features. My cnc router is just a 3 axis router with a rotating attachment, so i guess it is 4 axis machining. I am going to be carving out pictures, sculptures, wall hangings, and other types of 3d signs. I have seem more about artcam pro as far as 3d modeling goes, but i would like some other opinions about what would be best.
Thanks,
Troy