I actually like the pin more I think, I guess I wasn't super impressed with the "art book" in that yeah since it was free it was rather barebones and full of stuff I had seen for 12 years already lol. I appreciate the pin because, as it was already mentioned, it kind of gives a wink and nudge to the Disney side of the series still. And since its an actual collector's pin that makes it cooler to me. I only have a few from the actual parks but I like all the ones I have, so I guess I'm kind of biased?
I would like an art book for 2.8 more if it had new stuff for 0.2 though. And a lot of the Dream Drop concept art was quite nice actually, though I think I have some of it in the guidebook already (only reason I bought it I believe lol).