Solely on my experience there are definitely pros and cons for both.
High production will finish out like meat chickens compared to layers. So less days from purchase/hatching to butcher day.  They are much easier to keep contained because flying is not an issue. But the rapid growth and weight can cause leg problems.  I had one we fondly called waddles because she limped/waddled everywhere. She made it to butcher easy enough. Just was easy to pick out of the flock (I had 12 mixed breeds)
Heritage breeds definitely grow slower. They are harder to contain due to the ability to fly. I had 2 that chose the roof of my garage as their night roost when the A frame we built collapsed under their weight.  That is the main reason I am planning to get a hoop house built for the next flock. Definite pros is they don't have leg problems and forage really well.
Both are definitely easy to train (when you hear that they are the dogs of the poultry world it is not a lie) and were MY gateway drug to chickens. Your setup is definitely better thought through than mine was. We bought as we went. My initial plan was to house them in a coop at night and 

 free range throughout the day. Then I got chickens and everything went out the window