As far as happiness social policies go, Theocacy is the most powerful (25% of your citizens are turned happy), especially for large empires.
My social policy preferences have switched completely after the patch. I used to love honour and rationalism, while I now find both pretty useless and I have started to love tradition and piety. Both honour and rationalism starts off with a pretty useless bonus for the first point, and it is only worth the investment if you go deep.
Tradition's Landed Elite and Oligarchy is all you need to win any war as long as you stay within your own borders. The capital growth bonus is quite big now because cities can grow much larger than before. The wonder bonus is much better than earlier become national wonders have become so much more important. This tree is really on steroids compared to what it used to be.
The honour branch has become so much weaker because most promotions wont work against cities and the bonuses has also been slightly decreased. The rewards for waging war has been reduced so much that it's only worth picking honour if you know that you will fight for the majority of the game.
Rationalisms specialist bonus is just a shadow of it's former glory. The trade post bonus is still decent, but is now the main reason to pick this branch. Because you can no longer save up policies, the science boost will often come too late to make a big difference.
While Patronage didn't get any direct changes, the priority has been changed quite a bit. City states has become noticeably weaker. In addition research agreements seems to have become more important, so you'll need your gold for those RA's. This is combination with the fact that you really want to spend your points elsewhere has made this branch weaker.
Piety seems to me like it is quite a bit better now. Rationalism has become so much worse, which makes it more favourable to chose piety, and in addition the 25% population happiness bonus is substantial, especially because the cities grow much larger now.
Overall comments: It seems like everything has been boosted or nerfed double. Each social policy that got a boost also got changes in the game which multiplied the results. Each social policy that become worse also got penalties in the game that made it even worse. I think they might have been overcompensating a bit and taken it too far in the opposite direction, but I still think the balance is better after the patch.