* Ford F-Series pickup trucks: Overwhelmingly, the F-Series trucks have been the best-selling vehicles in the United States for decades and likely the best-selling vehicles worldwide in terms of overall units produced. This makes a strong case for it being Ford's most popular.
* Ford Model T: The Model T revolutionized personal transportation and is arguably the most iconic Ford vehicle. Its historical significance and massive sales in its time make it another leading contender for the "most popular" title.
Ultimately, there's no definitive answer without specifying the criteria for "popularity." While the F-Series likely wins in terms of sheer units sold overall, the Model T's impact on society and its era is undeniable.
