I find the mig the go to welder for me usually as I am normally welding steel. For heating things like rusted nuts I switched over to the yellow MAP gas cylinder with the adjustable tip years ago as I found it was more economical than using the oxy acc and can get things nice and red in a matter of minutes as long as the wind is not getting at it. If it is something outside in the wind I just make up a shield out of some sheet metal to put around the area I am trying to heat up. The MAP gas burns a lot hotter than propane and being able to grab the torch and carry it around is handier than rolling the welding cart around I find but it is all about personal preferences. Brazing and the torches were what I grew up with when doing body work and other repairs and don't regret learning the skill or having the torches still - switched over to the smaller user owned tanks about 25 years ago as the demurage each year I was paying (about 150.00 / year) was starting to add up and for the amount I used the torches I figured buying the smaller tanks would save me money over the years which it has. For welding cast iron that needs to be machined the torches and brazing rod produces a nice strong weld that can be easily machined with the lathe - something that mig welding will not do. Just wish my hands were a little steadier now that I am getting older - I usually hold the mig handle with both hands to keep it steady while welding.Using an oxy / acct. torch is sort of like riding a bicycle. People can explain to you how to do it, but until you try it you don’t exactly know how to do it. It’s good that you still had some “juice” left in your tanks! I seem to be using my torch set quite often. Truthfully I’d be lost without it. I find it rather handy for heating rusty, stuck nuts and bolts or sticking together smaller metal pieces with a dab of brass.