Brain Game: Meet Joe

Say hello to Joe, whose likes and dislikes will help you solve today's mentalfloss.com Brain Game Free-for-all Friday challenge. Good luck!

Joe likes things made of steel better than iron.
He'd rather travel by jet than by train.
Joe would rather pay by charge than cash.
And he feels he's more of a saint than a sinner.

With all these in mind, which one of these
four colors would be Joe's favorite?

red, brown, green, yellow