This kind of player is recommended for medium players with lots of time, very organized and if they want to build a very powerful empire that everyone will fear. You will have an incremental bonus when you build command centers. Expansionist duty is rule the galaxy, your economy will be very strong and you should buy exium and units to the other 2 kind of players.
This kind of player is the recommended for every new player. You will have a x3 in the exium mines extraction what will give to you the ability to get exium cheaper and will boost your economy. If you build many mines you may trade with it with your neighbours and will get an extra income
This kind of player is recommended for advanced players. You will have a x3 bonus in the labs bonus building laboratories what will give to you the ability to improve your tech level and research good units. You can sell advanced units or even sell your designs to other empires to get extra income. If you play well your options you can make lots of credits or exium and you will build a huge and powerful empire, based on technology.