Which series should I make: Srgt. Green's Marines or Cobalt Squad

I will make a series, either the "Epic Wins and Fails of Srgt Green's Marines" the "COBALT squad" featuring Spartan Cobalt and the rest of the squad. Or... >>>>>> ... a combo with both of them. I'll probably make a cross over like that later. All make all 3 eventually. Vote on what should come first.