[chc]

The most commonly used framework is not useful information if you're interested in "the advantage of using it over others." The most commonly used languages are Java and C++, but almost nobody would list them as the best languages. They're common because they were the chosen languages of the enterprise sector.

Nobody can tell you which framework is best. It's just not answerable question. Bob will tell you one thing, Alice will tell you something else, and then you'll have Devon over in the corner raving to anyone who will listen about how he wrote a complete Facebook competitor in thirty seconds using this cool up-and-comer called PHP On PCP.

What you choose is between you and your team. There isn't a right answer, or even something approximating one. If you've read pg's essays at all, you'll notice a common theme is that using a completely out-of-left-field language like Lisp was a key component to his company's productivity.