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.
I am amazed at radio DJ's today. I am firmly convinced that AM on my radio stands for Absolute Moron. I will not begin to tell you what FM stands for.

