I've been looking at the tech tree but still have trouble figuring our what unique bonuses and buildings each tech tree provide. This makes it harder to choose a tech tree for a custom faction and I would like to know what the average end game stacked bonuses come with each tech tree. There isn't a real in-depth explanation of what a tech tree's con and pro's are over another tech tree in comparison. I've recently checked the official wiki: http://galciv3.gamepedia.com/Technology
However have only learned about a single branch of the Thalan Tech Tree branch there. I would liek to know more about the Drengin and other tech tree branches on what they offer compared to to other Civ's tech trees.