Oh yeah, some are definitely harder! The more details they have the harder it is ofcourse! One of the hardest so far was probably Charizard, he's so majestic so you've gotta get him just right! And he has so many features, his wings, his limbs, long neck, its alot to keep track of motion wise!
After a while though it becomes second nature, as I'll become used to drawing them XD Thanks for the nice comment though