I also admit to liking the cookie part better than the filling.
Now, before you all shoot me, please hear me out. First of all, the cookie part is chocolate. The filling is vanilla. This fact by itself should already make the cookie part superior.
But really, I think it’s the “crunchiness” that gets to me. The middle is basically icing. And when you eat a cupcake, which part do you like better? The muffin part, obviously. (Unless you don’t. In that case, you do you.) The icing is just to add to the muffin part and make it taste better. That’s it. Not the other way around.
^Inspired by the horrified gasps when I brought out my Oreo Thins to eat as a snack