it really depends on what your building under the heads that should determine the type of porting you have done.
most CNC programs are a one size fits all and may, or may not be the best type of porting for your application.
for most of the stuff we build, i prefer hand ported heads to max out the combo for the intended purpose. pricing is generally close no matter which type you go with.
also, don't get hung up on advertised flow numbers, especially the peak numbers, as they can be all over the map. advertised numbers sell porting much like phony boloney dyno numbers sell engines. talk to some qualified people to find what's best for your individual application.