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.
“Even if I couldn't get my early novels published, I could still write. I went into newspapers, where I got paid to write every day. If there's a better school for would-be novelists, I don't know what it is.”