With base defenses:

1. PowerPlant
2. Airstrip
3. Hand of Nod
4. Refinery
5. Obelisk

Without Base defenses:

1. Hand of Nod
2. Airstrip
3. Refinery
4. Power Plant

Nod:

With base defenses:

1. Power Plant
2. Weapons Factory
3. Barracks
4. Refinery
5. AGT

Without base defenses:

1. Weapons Factory
2. Barracks
3. Refinery
4. Power Plant

That's my personal preference in general, but with certain maps it changes.