Depends on what "favourite" means. If I were to face my "favourite" dinosaur in something like a Jurassic Park kind of scenario then I would definitely not vote for the Tyrannosaurus Rex.
"Hi T-Rex, nice to meet you."
*GROMPFFF*
"Hi Human, nice to eat you."
"Hi T-Rex, nice to meet you."
*GROMPFFF*
"Hi Human, nice to eat you."