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.
“Arrogance, pedantry, and dogmatism; the occupational diseases of those who spend their lives directing the intellects of the young.”
“I considered Nat King Cole to be a friend and, in many ways, a mentor. He always had words of profound advice.”