I would without question choose the En Passant Checkmate, itz just too good to be true
You don't get anything for it. Your brief little ego boost to yourself, that nobody cares about, is worth $100,000 to you? That's insane.
money doesn't buy happiness, im not trying to get 100k to spend on stuff to make me happy, im simpy trying to enjoy life to itz fullest
If I can buy something that makes me happy (Chess.com memebership) I think money does buy happiness, but I get your point of view.
umm even if I defeat Magnus, people will say- "Magnus is a legend. It was just that he was playing bad. There is nothing special about you."
So I prefer the 100k