When comparing Axiom Verge vs Garry's Mod, the Slant community recommends Axiom Verge for most people. In the question“What are the best singleplayer games on Steam?” Axiom Verge is ranked 94th while Garry's Mod is ranked 112nd.
Specs
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Pros
Pro Great soundtrack
Pro Retro feel with a modern spin
Provides a good change of pace to what many modern titles offer. Axiom Verge is a well crafted combination of the original Metroid 2D platformer style, with unique game mechanics that make it refreshing.
Pro Somewhat complex story
While maybe not necessarily mind-blowing, it does have some interesting twists that one usually is more likely to find in movies rather than games. Also multiple endings.
Pro Tons of power ups to collect
In addition to having lots of things to find, the power ups give you diverse abilities that allow you to interact with the world in new unique ways.
Pro Beautiful art and environments
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 Poor weapon design
There are a ton of weapons, but most of them lack purpose. You end up sticking with just a few.
Con Not modern enough
It's intentionally retro style makes the world monotonous and dead compared to modern Metroidvania's.
Con Soundtrack can feel repetitive
While the soundtrack has some great electronic music, it can start feeling repetitive over long play sessions, especially when you find yourself just wandering around, looking for items or the next destination.
Con Too short
And no reason to replay.
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.