Hi gang,
Ceramic coating creates a kind of heat shield between the inside of the headers and the outside. This will reduce the overall temperature inside your engine bay.
My opinion on this ?? Get the stainless steel and get also some thermal coat band.
Why ?? Stainless steel because the headers will last mmmuuuccchhhh longer then the others, then isolate the headers with Thermal coat band to reduce the heat inside the engine bay, and to increase the heat inside the headers (better flow).
Be happy
!