When considering favoritism, I always go by who's got more stuff that I like from than any other, so considering that, I'm going with John Gurche, Mark Hallett, Charles Knight, John Sibbick, Raul Martin, Douglas Henderson, Ely Kish, Tuomas Koivurinne, Luis Rey, and Greg Paul. These guy's depictions were always the art that stuffed my favorite dinosaur books (and museum) as a child, and while not always accurate, their adherence to aesthetics is bar none.