Orange cupcakes

I looked up for the orange cake recipe by Nicko's kitchen
(check him out in youtube; I love his recipes, he made everything look easy)

And in the recipe, there was no butter/vegetable oil but he used milk instead.
I had some self raising flour so I decided to try the recipe; only I made cupcakes instead of a whole cake.
I divided the batter into two; one with butter; the other without.

Results?

I'm not really good in adjectives so it's not easy for me to explain.

The one without butter is moist, gooey, and didn't raise as much as the one with butter.

The one with butter is dry and hard on the outside.

I like both. They have different kind of texture and even taste slightly different.