Is Adam Smith’s conception of labor in terms of “toil and trouble” or Marx’s conception of labor in terms of “labour-time” more useful?

Is Adam Smith's conception of labor in terms of "toil and trouble" or Marx's conception of labor in terms of "labour-time" more useful?
Is Adam Smith’s conception of labor in terms of “toil and trouble” or Marx’s conception of labor in terms of “labour-time” more useful?

Useful in what sense? Both do a thing less common in modern economics: putting human labor front and center in discussions of value.