For what it's worth, Planned is only viable in the extremely early game, and is definitely not viable by the time you've researched Cyberethics (for Knowledge). Sole exceptions are for the Gaians, who can't use Free Market and can use Planned a little longer because of their Efficiency bonus (but they may want to max out their Planet score early on to pursue a mindworms strategy) and the Hive, who are immune to the efficiency penalty and only get a net +1 Econ from Free Market and therefore can't take full advantage of it until they unlock Wealth. Free Market is much, much better than Planned in the early game, though it requires some thought to use properly.
Generally, Democracy/Free Market/Wealth is the best set of options early on, switching to Democracy/Green/Wealth later, as your empire gets large and you need to fight vendettas. Only disadvantage of Wealth over Knowledge is that no one favors Wealth (so you get negatives from the University and Spartans and no positive from anyone), but Wealth is nearly always better than Knowledge, and often gives you a faster tech rate, and is obviously better than Power.
Of the late-game social advances, Eudaimonic is clearly superior, though the other two are reasonably viable if you build the Secret Project that negates their penalty (the Network Backbone for Cybernetic, the Cloning Vats for Thought Control).