I've owned lots of both and the Ford's have been consistently more reliable and equally cheap and easy to repair. Not to mention used Ford's are the cheapest cars out there, and assuming you are willing to put a few hundred into repairs from the onset, I have found great bargains over the year. I've got 3 Ford's now, all reliable, good 15+ year old cars.
Anyone who chooses either of these is too stupid to realize that it doesn't matter. First off, the half ton toyota tundra has a better towing capacity, better transmission and general warranty, and is built more so in America than any for or chevy, the only difference is that the revenue goes to Japanese economy. Also, I have personally owned a shevy silverado, and a for f150, and neither of them last nearly as long as my tundra, and I work in the woods a lot, so I beat my trucks. Those trucks are pretty, but useless, just like most of the owners.
Both companies have a very long history of being rivals, and believe me, they both have made great cars in the years, but I chose ford because of their reputation, along with style. To be Ferrari at Le Mans, and not even with another European car company, but with their own Ford Gt, is pretty awesome.