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what really matters is the quality of the stainless steel. Cheap stuff cracks because generally its not the grade they claim to be using OR the flange and the tubing are different in material which causes a lower quality weld.
I would opt for stainless steel over mild just from what i know regarding materials. Even with a ceramic coating, you'll get rust eventually. Heat cycling, salt, moisture etc seem to work their magic on ceramic coatings. Then there is always the chipping aspects.
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