Oh ehm yeah sorry, I was talking mainly about the austrian where 5. ... c5 is an option to attack the center. So basically if there is any method to whether I go with the main line or dragon formation, or if it's just preference
Pirc Defense's fifth move

Hi! My preference is 5...0-0 6. Bd3, Nc6 with the idea of 7...e5. It is a somewhat theoretical and sharp line but worth learning.
Good luck!
Hey, I was looking into the Pirc and was wondering how one chooses what to play as the fifth move. As far as I'm aware, the two most used options are 5. ... c5 and 5. ... O-O. But I couldn't figure out when to play which, so my question is:
Is there a prerequisite to either or is it just a matter of preference whether I want to contest white's center early or finish my development?