The first one is blue steel, which is what we have for a crepe pan (and it works very well). It's not cast iron, though (see the blue steel part). I'm not an expert on metals or whatever by any means, but we have the blue steel crepe pan and then we have a cast iron skillet and a cast iron grill pan, and there seems to be a huge difference in texture between blue steel and cast iron. The blue steel is very very smooth, whereas the cast iron has a roughness to it. I don't think we'd be able to make crepes in the cast iron skillet, at least not very well. Oh- and the cast iron is way heavier than the blue steel, which also probably impacts the crepe making process. They do have some similarities- you can't wash either of them with soap, you have to get both of them completely dry after washing with water, and similar to the seasoning process with cast iron, you have to rub a little oil into the blue steel before you put it away.
So my vote is for the first one, the blue steel. And now you've motivated me to haul mine out and make some crepes today!!
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