Some people "think" Freon is "safer" because Propane based refrigerants "explode."
The fact is that any R-12/22 based "Freon" product has it's own dangers. First of course, is that any system contains circulating flammable oil. And that burns just fine, thank you very much.
The second thing is that Freon based refrigerants, when exposed to a fire in progress, generate deadly phosgene gas.