Can't stand propane for cutting. Unless you're cutting 2" thick plus where it is better than acetylene.
It's a sod to light on a windy day, takes 3 times as long to set your flame, wider kerf, more heat into the plate, slower cutting speed. You use a lot more oxygen too.
Pre heating or burning its the way to go 100%. As said you get tonnes more BTU and its cheap.
If you’ve got a bit of plate to hold the torch to it’s a lot easier to light as the propane puddles rather than just dropping away.We use Oxy Propane here just for heating and an odd bit of cutting.
It is a pig to light and set a torch flame (I thought it was only me that had this problem)