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I'd run R134A unless the system started life as an R12 system because R12 systems seem to a PITA to keep running (around here at least) due to the fact that almost anyone that will spend money on AC has a car running R134a and thus almost nobody carries anything for R12 systems.
I manage cold air in my prizm (air coming out of the vents is 90-100F colder than the condenser so when sitting it ends up being 60F below the outside air temperature and it only stops there because the compressor cycles off) and it is a very crude R134A system (they barely changed the design from the R12 system, I'm not even sure if my condenser has a higher FPI.)
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