I have two terminator squads. One which is armed with mostly pairs of lightning claws and a chainfist/combi melta. The other is a more shooty squad, armed with a mixture of weapons, but all have a gun and a combat weapon.
My question is this. What marks to give the terminators? The close combat unit will have mark of slaanesh, as this makes them better against most things that can kill them, eg other terminators, mariines with power weapons etc.
The other squad I am not sure on. I am leaning towards either nurgle or tzeench, I can see benifits of both. As I can field 10 in this unit, I would consider a mark nearly essential for the small cost per model.