It's honestly like a favor of the week contest between 3 year olds.

6 years ago it was Air Wisky and Comair
3 years ago it was Skywest and Expressjet
This year: RAH

Its a moving target. Which ever will hire you, pay you the best (oxymoron I know) and give you the best quality of life (again with the moron) is the best.

PS People will disagree with what I've said, you can basically substitute anyone with who I just named.