Not much of a contest here. Competing successfully in today's commercial radio marketplace is fundamentally about choosing and executing a programming format that appeals to a large enough audience so that advertising will be effective. Compelling programming begets ratings. Ratings beget revenue. Revenue begets profits.
Profits beget sustaining a business so that employees and shareholders can be paid.
Radio economics 101. Even most NCE stations which have to generate underwriting dollars and live within a budget have figured this out. Formats which feature too much variety have historically been losers. They prefer familiarity and consistency yet not too much predictability. Ask any successful programming consultant.