Use the MIG (by definition that is with gas) as opposed to the flux cored no gas. The flux cored gasless has its place but not for your application. There are flux cored wires that require gas but lets keep this simple.
And for oxy/acc welding you can use the filler used for the MIG if you want to bother straightening it out. But we used to use the coat hangers all the time on mild steel. Saved time going to the welding supply and spending money on 36 inch straight lengths. But sure POed mothers when all the clothes in the closet were left on the floor.
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