I used to work in a parts house, and still have a friend who works there, and he is one of the most knowledgable people on vehicles I know. They sell more Ford and Chevy truck parts then anything else. They sell the least parts for Dodge, with Toyota and Nissan falling just behind.
If I were to buy a brand new full sized 4x4, I would go with a Dodge Ram. I like the way they drive, and prefer the interior layout over Ford and Chevy by a long shot. I've never driven or ridden in a Titan, so I can't speak for it, but I really don't like it's looks. If I were to get any truck I wanted, I would probably go with a 2002-4~ model Toyota Tacoma. I used to have a 95-1/2 model Tacoma which was, and still is, the best truck I've ever owned or driven.