Is cardio or strength training more important for rugby?

The demand of rugby is usually a steady-state for most players throughout the game, except some skill players who have more sprints at different intervals in the game.  The cardiovascular demands are high for long periods of time.  Using aerobic and anaerobic energy systems for strength and power in rugby is crucial.  Strength training is very important for both overall size and, more importantly, power (weight and speed).