Build order: tvt openings

STANDARD 10 DEPOT
10 depot
11 rax
12 gas
14 OC
14 rine

STANDARD 9 RAX (Fast OC, faster tech)
9 RAX
10 gas
11 OC
11 depot
11 rine

Here are some builds I've used in the past:

1) Fast siege, FE - this is currently the one I use the most.

Use the STANDARD 10 DEPOT opening or 9 RAX opening if it's a small map (prevent cheese) then get..
factory
tech lab
starport(if you scout a banshee opening, otherwise marines are fine)
research siege
make tanks
CC when you have the minerals
2nd gas after CC
i usually get a reactor on my barracks
always make supply depots when needed (~4 away from max supply)

You may need to bunker with marines at the start if he plans on early pressure. Scout!

And of course make marines for tank support with extra minerals you may have.

2) 1 rax 1 fact 1 port Banshee/cloak opening

Use the STANDARD 9 RAX Opening then get..
2nd gas
factory
tech lab on fact
starport
swap with factory
research cloak
create banshees
always make supply depots when needed (~4 away from max supply)

You may need to bunker with marines at the start if he plans on early pressure. Scout!

And of course make marines for support with extra minerals you may have.

this will work wonders if they're unprepared in any way, and even if they are. Good harass opening which can transition to pretty much anything as you have 1 of each building.

3) 3 rax 2 tech Lab 1 reactor stim all-in

Use the Standard 10 DEPOT Opening then get..
tech lab
rax rax
1 marauder
research stim
reactor when available
tech lab when available
always make supply depots when needed (~4 away from max supply)
etc etc

go when you have enough energy after your 3rd MULE for a scan.

When attacking scan choke (up cliff) if needed.


4) 2 Tech Lab upgraded reaper harass FE

Use the STANDARD 10 DEPOT Opening then get..
tech lab/2nd gas
2nd barracks with tech lab
upgrade reaper speed as soon as first tech lab is done + gas available
make around 5+ reapers (personal preference)
create CC when minerals available
harass with reapers(distraction)
always make supply depots when needed (~4 away from max supply)

You may need bunkers or a planetary fortress until you get tanks if they plan heavy early pressure.



Tips:
-create barracks for scouting (more cost efficient than a MULE)
-sometimes I like scanning on my 2nd energy accumulation to scout, esp if i'm not sure, or if my rax is too far away/can't make an extra one in time
-later in the game in TvT MULEs aren't very useful as you will have an excess of minerals, scan to your heart's will
-marauders will really hurt tanks, make sure to have marine support or marauders of your own against mass Bio
-claim as many geysers as possible
-late game BCs are very powerful. Transition to them carefully, but not too late. Always have a reactor starport to make vikings for support, you need to mix them with your BCs. Yamato cannon is a must, use them to snipe enemy vikings.