Terran vs. Terran would make an interesting game although whoever is the fastest will win (1on1).

- Get lots of Marines early on and try to rush. Add in some firebats.

- Make tons of Siege Tanks and be sure you've researched Siege Mode.

- Your attack force should consist of mostly Siege Tanks along with a few Wraiths or Goliaths.

- Don't bother to make a quick run for Battle Cruisers, SCI Vehicles, or Ghosts. It'll greatly hurt your speed and resources. They'll benefit you only late in the game now.

- If your enemy has no Missile Turrets, then cloak your Wraiths. They can still see you with SCI vehicles, but you should attack early on with Wraiths. If they have SCI vehicles early on, then they're very weak from wasting resources on the buildings necessary to get SCI vehicles out. Similarly, don't build SCI vehicles early on unless you know that your opponent has an all-out defense of cloaked Wraiths. Use missile turrets to spot cloaked units on offense.

- If your enemy abandons an add-on, you can move the appropriate building there and attach it to the add-on.