Repair Ferrule vs Weld-on fitting

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I’m replacing the hoses on my ac system and have cut off the old ferrules from the beadlock fittings on a couple sections of hard tubing (steel) that I need to reuse. Has anybody had experience with the repair ferrules that have the oblong hole, versus welding on a new fitting. I have a MIG welder, but want to know if the repair ferrules are just as good?

Thank you.