Part 141 versus Part 61.
Really nothing in it. Quality of training comes down the the instructor you fly with, and that can be very good or very poor under both systems. I am not aware of any airlines in New Zealand choosing pilots based on where they learned to fly.
CAA are in the process of making it compulsory for any training other than PPL training to be conducted by a part 141 organisation. All in the interests of improving standards you understand.
CTC
Usual progression for their multi instructors is Eagle & Air NS.
Well you might be surprised to learn this happens at most aero clubs and flying schools.