Yes definetly pros and cons (thanks Endoperez for the quote)
All of these answers also depends on what race you are playing. A tactic that works well for Jutenheim Giants would not work the same for a Pangaea, or Caelum. The game is designed so that everyone can beat someone, but no one can beat everyone. At least not all at equal levels of ease.
Play with all the races abit. Search here for racial tactics. You probably have a playing style (aggressive, defensive, barbarian horde, stealth, diplomacy, research magic, item artificer, RPGer prefering strong single units). Find the race which best matches your playing style. That will win you more games than trying to force certain tactics on the wrong nation
Gandalf Parker