Factory or Original A/C

[mjsmith]

Went to the trouble and some expense to install original A/C in my non a/c 72 pickup. Have changed out the dash and bought a junk truck for most of the original parts. Now I'm having second thoughts about original vs Old or Vintage system. Do the new system's cool better? Do you get better milage? If I go with the orginal setup, what parts need to be non-orginal to convert to new coolant? What is the better setup for a 72 pickup, Vintage or Old air?

I'm not building a show truck but a nice ride to take fishing and camping.

Thanks, Mick