When comparing Starcraft vs Garry's Mod, the Slant community recommends Starcraft for most people. In the question“What are the best LAN party PC games?” Starcraft is ranked 9th while Garry's Mod is ranked 27th. The most important reason people chose Starcraft is:
There are three selectable races in the game, Terrans, Protoss and the Zerg. The Terrans being human, while the other two are alien races. What makes the game stand out is that each race feels exceptionally different from one another, each with their own personalities. This makes for a different experience depending on what race has been chosen to play with.
Specs
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Pros
Pro Tons of personality that keeps the story and gameplay interesting and entertaining
There are three selectable races in the game, Terrans, Protoss and the Zerg. The Terrans being human, while the other two are alien races. What makes the game stand out is that each race feels exceptionally different from one another, each with their own personalities. This makes for a different experience depending on what race has been chosen to play with.
Pro Built-in offline LAN support
Being an older game, Starcraft suports offline LAN due to not as many people having internet back when it was released. This is something that many games (including Starcraft 2) regrettably do not feature anymore.
Pro Well balanced race selection keeps the gameplay fair
The game is fairly well balanced, so nobody gets an advantage by choosing a certain race. While each race will have their own unique abilities, the balancing of these abilities allows the game to play even handed, with no real advantage to any race.
Pro This game can be downloaded for free
Blizzard is now offering the original Starcraft (titled Starcraft Anthology) as a free download.
Pro Highly specialized units that are easy to learn but hard to master
This helps keep the game challenging and interesting even at a high level of proficiency.
Pro The games mechanics and mods allow for ridiculously funny gameplay
You can do some really crazy things in this game thanks to all of the community mods available as well as the built in, in game tools. Pretty much any scenario can play out in the game, if you so desire. Of course the winning combination of funny tends to be when players are just goofing around.
Pro Tons of community made add-ons allows the game to continually grow
Garry's Mod has a wide variety of community made add-ons, which deeply extends the games content and versatility. Pretty much, if you can think of it, someone has probably already made it.
Cons
Con Old and outdated
With the original release dating back to 1998, the game is quite old now and its graphics are not on par with current game offerings.
Con Lacks widescreen support
Starcraft is only available in a 4:3 resolution. However, a hack to make it work in widescreen can be found here.
Con It has nothing to tell as a campaign. Tastes like void, that is "meh".
Con Previously free to download
Garry's Mod used to be a free download but it is now a paid game on the Steam store.
Con Tons of bugs
At least in earlier versions.