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This is perhaps the most frequently debated topic on all of Flyertalk. There is no answer because the value is established when you redeem, not when you earn, and it varies by individual.

To estimate your value think about how you would redeem: domestic vs international destinations, simple point-to-point trips or complex itineraries with stopovers or open-jaws, economy or a premium cabin, roadside inn or luxury resort, etc?

In general, airline miles (and points which can be converted to miles) are worth more than points with a fixed monetary value, but when evaluating credit cards you must also consider the amount of spending required to generate the points. One AA mile may be worth more than one ThankYou point, but if you can generate more TYP per dollar of spending the ThankYou card may offer better value.