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I've never used propane, only acetylene, but the obvious benefit of propane is costs and availability. Acetylene is expensive to buy and relatively difficult to get hold off without having to hire the bottles and have a contract with someone like BOC. The downside of propane is that acetylene has a hotter flame and so is better for things like fillet brazing where you need a lot of heat in a small and accurately defined position.
What’s the pros and cons for Oxy-acetylene or Oxy-propane?