Regarding builds, my standard build order in every matchup is always 1rax expand then go transition into whatever strategy I want, but Reaper expands are very popular nowadays. The most standard unit composition per matchup is:
TvT : Marine Tank, pure bio, mech.
TvZ : MMMM or Mech
TvP : MMMVG, occasionally mech.
Also, the Terran help me thread in TL will help immensely in...helping you.
Gas 15 Marine Marine reactor CC fact port with Reactor Hellions + Viking(s) or Medivac before a bio or mech transition. Bogus/Innovation vs Flash, Neo Planet S, MLG.
If you see any reference about the "LG-IM build order," it's about the core of this build.
Some kind of Reaper expand into 1-1-1 with the same possibilities as above. Dream vs Mvp, Akilon Wastes, IEM [starts at 0:05:12].
The Reaper(s) give(s) you extra scouting possibilities. The old gasless 1 rax expand is possible too with some precautionary measures (see "Is gasless 1 rax expand still viable? in the TvT section below).
Some kind of Reaper expand into 3 rax Medivacs with EB before Factory (bio/biomech). Taeja vs FanTaSy, Star Station, Code S; Apocalypse vs Dream, Star Station, ATC.
Same as above.
Reactor Hellion expand with an early Armory and a Starport (mech, drop Hellbats). ForGG vs LucifroN, Star Station, ATC Karont3 vs Millenium.
1-1-1 expand. Mvp vs YoDa, Antiga, IEM [starts at 0:28:25].
Can be played defensively or offensively depending on what your opponent is doing.
Both Marines/Tanks and mech are viable midgame. Against mech, both pure bio → air and bio/Tanks are feasible. Pure bio is not viable against Marines/Tanks.
TvZ
Proxy 11/11 (or 11/12, or 12/12) with at least 3 SCVs pulled. Flash vs Life, Newkirk City, MLG; Last vs Stephano, Cloud Kingdom, MLG.
Proxy Reapers (11r 11g or 12r 12g) into fact CC CC or CC fact CC. Mvp vs Stephano, Akilon Wastes, IEM [starts at 0:19:36]; Last vs Life, Akilon Wastes, MLG.
CC rax gas fact reactor CC with a bio transition behind 6 Hellions and 2 Mines. Flash vs Ret, Cloud Kingdom, MLG.
Some kind of Reaper expand, with or without Bunker pressure, into fact reactor CC with a bio transition behind 6 Hellions and 2 Mines. Flash vs bly, Neo Planet S, MLG.
Gasless 1 rax FE and 1 rax gas 15 expand are also possible.
Agressive Hellions/Banshees (particularly for mech). Sting vs Ret, Ohana, IEM [starts at 0:52:57] for a mech transition; Flash vs Soulkey, Newkirk Precinct, SPL Special match for a 4M transition. Other Starport-based harass are possible, generally with an early Armory for Hellbats drops if you want to mech: LucifroN vs HyuN, Newkirk Precinct, ATC.
4M (Marines/Marauders/Medivacs/Mines), Marines/Tanks and mech are viable midgame.
TvP
Gas 15 Marine Marine reactor CC fact port making two Mines and a Medivac with a bio transition (ideally rax rax lab lab EB reactor). YoDa vs First, IEM (except the Entombed Valley game); Bogus vs MC, MLG; Flash vs PartinG, Neo Planet S and Akilon Wastes, MLG.
Can be played defensively or offensively depending on what Protoss is doing and whether he expanded or not. Offensive possibilities include poking his natural with some Marines + 2 Mines and the Medivac, dropping 1-2 Mine(s) + Marines or only Marines, or even just flying over the Protoss base with the Medivac to scout what he's doing. You also have the option to get Vikings and extra Mines against agressive Stargate play.
Some kind of Reaper expand into 1-1-1 (or at least Factory) with a bio transition. Polt vs Creator, Daybreak, IPL FC 48; Polt vs Creator, Akilon Wastes, IPL FC 48; Bogus vs Rain, Whirlwind, MLG.
A commonly used build order is rax 12 gas 12 reaper reactor CC bunk (if needed) fact port.
Some kind of Reaper expand into 3 rax with an early EB if needed and possibly a quick Stim. Polt vs HerO, Cloud Kingdom, MLG Showdowns; Polt vs HerO, Entombed Valley, MLG Showdowns; and Bomber vs Creator, GSL (all games except the Whirlwind one from the first series); Flash vs jangbi, Akilon Wastes, 2013 Korea AIMAG.
The EB can be built at a standard WoL timing if you can rule out Oracle play with your scouting, or you can build that quick EB anyway to get fast upgrades.
Some kind of rax fact or 1-1-1 expand with an early Armory (mech). Taeja vs SaSe, Neo Planet S, MLG.
You can also play bio after such openings, without the Armory of course.
CC first or gasless 1 rax expand at your own risk (see "Are gasless expands still viable?" in the TvP section below) and with an early EB against Protoss going dual gas. Ryung vs MC, Star Station, GSTL.
Bio is still standard. Mech is vaguely playable but considerably inferior.
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Formerly known as neozxa
Instead of complaining about balance, try, try again.
Earlygame ZvZ is basically a knifefight with suicide bombers.
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