In true consulting style, answering this Q requires setting given assumptions. I'll provide my own:1) It is a question of which of the two (n'workg/delivery) will enable you to "get ahead" further and quicker.2) Delivery is a given - a "hygiene factor", if you will. It comes down to technical ability, organisational skills, intelligence, and the basic things, without which, no aspiring MC should have arrived at mid-mgt level in the first place. Of course, standard of delivery can vary, but he/she who does not deliver the required quiality will not be in the "getting ahead potential" pool anyway. As long as the above assumptions are true, then numero "one" (in the words of Alan Partridge), is Networking. As your ability to spread word of your work and market yourself (=networking) is what will set you apart.