Well, on a personal level, I would leave the dinosaurs as a further existence species as it could leave quite a great level of knowledge on the past, and increase interest in subjects such as history and paleontology. However if I were to go on a statistical level, then I would have to go against the proposal of saving the species, as there is an incredibly high chance of an outbreak and the slaughtering of millions of people. No matter what precautions you take, there is always a way around it, and dinosaurs are a species of higher intelligence then it is given and they would find a way around this.
If I were to give a moralistic stand point, then once again, I would have to deny the proposal, as I see it as a sign of further growth among species on Planet Earth. That is also true on my religious standpoint as well.