What's great in theater is that you can sustain the arc of a character for a full three hours, whereas in film or TV, you have to create that arc in little pieces, and usually out of sequence.
As far as acting in films, there is not much out there that is very interesting to do. The ones that are interesting to me are independent films and they have trouble raising money. With people putting their money into blockbusters, there is not much left for the independents.