Based on the description, something like this
I know you're asking which of the two options to keep (and my answer is the stainless, because as much as I love cast-iron, if I had to only use one for the rest of my life, the stainless is more versatile), but to consider for the future: you can buy enameled cast iron skillets! Cuisinart, Lodge, Tramontina, and Le Creuset all have them. Both the exterior as well as the interior cooking surface is enameled on all of these, even though it doesn't look like it in the photos.
Edit: I suck at formatting.