I'd be remiss if I didn't say that the ninth movie didn't introduce a pretty sick breed of sharptooth to the series; of all of the sharptooth species, within the context of the series, I have to say that my favorite is the Liopleurodon.
Honorable mentions go to Tyrannosaurus, owing to a great design (before the art style changed, anyway) and a rolling start with the first movie (its later appearances hold it down, to put things mildly), and Spinosaurus, for no other reason than it being my favorite non-avian theropod outside the series.