I wouldn't say one is easier or more difficult, but when you're inside a costume and a mask, you have to endure heat - and, often, difficulty seeing. The vision is not very good in a mask. And you have to cope with that, as well as trying to think about this character.
“It was easy to present figures demonstrating the contrast between lead work in the United States under conditions of neglect and ignorance, and comparable work in England and Germany, under intelligent control.”