You will get very few answers to your question at this site.
Try Excapees MDT site or Freightliner Club site for a lot of answers for any question you asked.
I have an International so sorry I can not help you.
The M2 is made in old Mexico and is not as trouble free as the International.
There are by far more Mid-Duty International than there are Mid-Duty Freightliners sold and in use in the USA. The International is all USA.