Voted stainless, have had experience with both on same application(downpipe). If I'd gone stainless the first time would've saved enough money to buy rest of exhaust system, not to mention time lost etc.. Granted my environment is rough, cold, sandy and salty, ceramic coating seems not to like quick extreme temperature change in concert with a dose of sand and salt, but if stainless is nearly bullet proof here, last forever in BC, Southern ON and SO Cal.
I think brittle concerns can be addressed with milder nickel content stainless, don't remember spec numbers but we've built some things from that type that took a pounding, flex and vibration, and didn't break. It will corrode a bit, but probably last longer than a lot of marriages and the vehicle it's on. I won't have anything but stainless on my vehicles
Just my 25 cents worth