Do authors get more money from ebooks or physical books?

Sometimes, I’m not really sure if I should buy the ebook or the paperback. Especially when I’m specifically buying a new copy (as opposed to buying a used, and much cheaper, copy) because I want the author(s) to have money for this work. But I don’t know if they get paid less for one work – maybe if I buy the Kindle version, they get 50% of what I pay, but if it’s the paperback, they only get 30% of what I pay. Maybe it’s actually the exact same amount of money, but a reduced percentage to cover the cost of making a physical book.

Is there some guide out there on this? That, sure, authors are mostly just happy you’re buying their book, but if they could chose for you which version you’d buy based upon how much money they get from each, they’d choose….???