What to choose?
Not all armies are suitable for you. It depends on your personality, which side would you want to be on, (Good, Bad, For the Greater good) it all goes to you. You can decide, you don't have to do what we say, this is just according to us.
This little table below shows you our reccomendations.
Side Army Type
Good Space marines Human
Good Impearials Human
Bad Orks Orks
Bad Tyranids Aleins
Bad Chaos Space Marines Infected Humans
Bad Eldar Aleins
For the greater good Tau Aleins
Bad Necrons Aleins