How much do you want to set aside for meals out, or divert to a specific savings goal? YNAB, for the most part, answers the question where do I want to spend my money?
How much of your pay cheque do you need to devote to electric, water, gas. YNAB helps you decide how much money gets spent where. Mint, for the most part, answers the question where does my money go? How much is going to your groceries, or specific grocer? How much are you spending on this or that other thing? Mint is a great tool for getting that snap shot and see trends over time. Mint is great if you want to get a sense of where your money is going. As I am sure has been outlined above, Mint and YNAB are very different tools.