Propane-Thats what I use,I would suggest it over acetylene anyday.It's cheaper,cuts smoother and better,lasts longer,and also it is easier to lift a bbq pit sized tank(5 gallon) on the back of your truck rather than a heavy ol bulky acetylene cylinder.If only it was hotter.If it was I think it would take over acetylene for good.Although who really gas welds anymore? I seldom braze and solder but i hardly ever gas weld because gas welding doesn't provide any protective coverage from the atmosphere.I use to weld mufflers with the gas welding process but not no more since i bought me a new mig and c25 tank.Now the only problem I have with mig is you really can't weld in the wind without blowing off your gas coverage and flux core wire is too expensive to buy in bigger rolls and stick welding can't really be used on lighter metals unless i unplug my lincoln and run my ac/dc T-Bolt although stick is what I use for anything structural and critical like for example if im building a gooseneck trailer or a tandem that i built that i got in my photo collection.Until i buy me a new mm251 in a couple of weeks I will just use stick but I really need to get down to the supply shop and get me one so I can mig welder thick weldments.There's so many suppliers in my area that I'm only halfway through the phone book to find the best deal on the 251.I found some competitive prices but i think i can find better
Lincoln Classic 300D
Journeyman Torch setup
Big ol heavy clumbsy Oxy/Acetylene cylinders
'99 Peterbilt 379exhd w/ 550 Cat
'02 Dodge Ram 3500 4x4 Cummins 24 Valve
LOTS of Firearms.