When comparing Axiom Verge vs Garry's Mod, the Slant community recommends Garry's Mod for most people. In the question“What are the best indie games on Steam?” Garry's Mod is ranked 27th while Axiom Verge is ranked 28th. The most important reason people chose Garry's Mod is:
Garry's Mod has a wide variety of [community made add-ons](http://steamcommunity.com/workshop/browse/?appid=4000), which deeply extends the games content and versatility. Pretty much, if you can think of it, someone has probably already made it.
Ranked in these QuestionsQuestion Ranking
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 Great soundtrack
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.
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.
Con Great but repetitive soundtrack
This sounds like an odd con but while the soundtrack is some great electronic music, it becomes pretty repetitive when you find yourself wandering around looking for items or the next destination.
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.