Things the alien com makes can only be on creep and build automatically. Although if heal sprayed they build faster.

Alien com can control where people spawn by using the shifts.

It is hard for a marine com to select the "wrong" tech and lose the game. An alien com can get the wrong tech patch and lose the game. (Not literally but make it much harder to win)

Alien com can not provide direct support in the way marine com with medpacks can.

Also hives should always go: Shift -> Creg -> Shade

If you do any other order besides that you should have a 5min presentation and speech prepared to explain why upon the beginning of you entering the hive. Submit presentations in a separate thread and I will evaluate them.