A smart combination of both techniques.
Both although it depends on the sequence.
Anyone remember the scene in Casino Royale where James Bond goes after the bad guy parcour style. There is alot of CGI used in that sequence but it plays out so well that you do'n't notice it.
then the question should be '' do we want better effects? ''I'm more for live action. I'm so involved/familiar with 3D work that I can spot CGI easily, and I nitpick more than praise it. If a film doesn't call for it, then don't use it. Also, unless its ILM or WETA, it sucks for the most part.
Live Action, with CGI enhancements.
sometimes the problem is the director.it's really based on physics.
If the CGI body double doesn't have any gravity or mass, then it'll look fake.
i think they are.so directors like David Fincher and Gur del toro are probably more understand of the CGI field, since they have extensive knowledge.