Well considering that games have to be rendered in realtime, and movies are pre-rendered, that's why movies look so much better, at least for now..
Some of the new graphics cards out there are rendering amazing images on the fly... As for which is harder to do, I think games are harder because there is more programming required. 3d object implementation in movies is one thing, but with games nowadays that's 100% of what needs to be done, but not only that, but a full program behind each game to tell the computer what to do when certain keys are pressed, how the image should change, how perspective should change, etc, etc, I could go on and on.
Good videogame programmers are making high $xxx,xxx per year on average now. It's a booming market and one of the best to get into. It's also extremely competitive as well though, and you need to be good to get the good jobs.
Of course good Hollywood 3d animators are making insane amounts of cash as well... The two industries are quickly becoming one anyway..