I own both of them personally and they are fantastic, but I would really recommend the M12 heated jacket or hoodie, and not the jacket, as you can add more layers to it. For eg, you can add a sweat and a sweater on top of the sweater so your body can get the heat closer to your vest. The use of the jacket only allows you to place layers below to limit the effectiveness. I have a more relaxed wear with my sweater, go to the store and so, and it looks more fun. They work very well, however, so whatever you think is best for you.
