The answer is both.
Over at the website of Smithsonian Magazine, George Goodwin, the author of the brand new book Benjamin Franklin in London: The British Life of an American Founder, argues that Franklin was an intellectual in the British Atlantic world before he became an American revolutionary.
Here is a taste:
…It was only then, at the age of nearly 70, that he discarded his loyalty to the British state and became a fierce advocate of American independence.
Yet even as an American patriot, Franklin once again returned to Philadelphia with British enlightenment values that influenced his fellow Founding Fathers. Having arrived in London with two slaves, Franklin now supported calls for abolition. Though he did not convince Thomas Jefferson on that matter, he did on others. Jefferson’s choice of portraits for his entrance hall at Monticello is instructive. In the most prominent position are three of Franklin’s own British influences: Bacon, Newton and Locke. There is also a fourth. It is of Benjamin Franklin.
As for Franklin himself, he never quite gave up his Atlanticist dream, even after independence was secured. But now it was to be on a different basis. In 1784, he half-jokingly, if in strictest confidence, wrote to his long-time British friend William Strahan with this suggestion: “You still have one resource left and not a bad one since it may re-unite the Empire … if you have not Sense and Virtue enough left to govern yourselves, even dissolve your present old crazy Constitution, and send Members to Congress.”
Read the entire piece here.