When comparing Project Zomboid vs Factorio, the Slant community recommends Factorio for most people. In the question“What are the best low-spec PC games?” Factorio is ranked 9th while Project Zomboid is ranked 48th. The most important reason people chose Factorio is:
With proper planning, users can "code" together very precise ways to create all the things needed for the game, some in very inventive ways that can differ quite a bit. This allows for tons of replayability.
Specs
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Pros
Pro Can truly challenge your survival skills, creating an environment where you must adapt fast in order to survive
While you can turn the difficulty down, PZ can present a true survival horror experience for those that are interested in it. In PZ zombies pose and actual threat, crafting is not easy, fortifying your shelter is hard and a the tiniest mistake can be fatal. And there are so many tiny mistakes you can make - forgetting to change your bandage might get your wounds infected, leaving the stove on could burn your house down. The odds are stacked against you and you won't win, but let's see how long can you survive.
Pro Zombies pose an actual threat, keeping the player always on their toes
Unlike many other games in the genre, Project Zomboid manages to instill fear of zombies pretty quickly. You are considerably outnumbered and the smartest move in many cases is to run away from an encounter. You're not superhuman in this game, zombies will overwhelm if you're not careful.
Pro Well-realized bleak atmosphere that suits the game perfectly
You truly feel like your survival is at stake. You are constantly reminded of the ever-present danger of zombies everywhere with sound cues. And even though it's a top-down game, your field of view is limited - zombies could sneak up on you or you might run into one around a corner. Any move you make could be your last one.
Pro The competent weather systems gives a feeling of realism to the game
There is randomly generated weather in the game, which can effect your character such as getting sick from being wet and cold. This offers a level of realism that makes perfect sense in a survival title.
Pro Feels more realistic compared to other survival horror games
Project Zomboid feels less arcadey compared to similar games. You are not an all-powerful character capable of carrying the town's arsenal in your backpack and taking on hordes of enemies alone. If you break a window to get into a house, you might get cut, if you decide to stock up on food and not use it, it will rot, etc.
Pro Easily adjustable difficulty creates a game that anyone can feel confident in trying, no matter their skill level
You can adjust the difficulty in sandbox mode, which can greatly impact the way the game plays. You could make it extremely easy to survive, but the opposite can also be accomplished with the with a more difficult setting.
Pro Character traits add more fun to the game, allowing you to customize to your liking
You can level traits as you play like strength, carpentry, cooking, etc.
Pro True sandbox gameplay where you are always free to do whatever you like
There are no missions in Project Zomboid, meaning the player can do anything they can think up, at anytime they want. This gives a level of freedom not always found in games, but of course makes for a great way to just waste time screwing around and testing the limits of the sandbox.
Pro Endless solutions
With proper planning, users can "code" together very precise ways to create all the things needed for the game, some in very inventive ways that can differ quite a bit. This allows for tons of replayability.
Pro Under active development
The game is still in Alpha which means endless future possibilities.
Pro Massive and infinite procedurally generated world
The playing world is as large as you want to explore, it automatically generates it as you explore more areas.
Pro Cooperative or PvP building
Factorio also supports multiplayer, allowing many players to cooperate and assist each other, or work against each other in PvP. By default, multiplayer games run the CO-OP freeplay scenario where all players work together to launch a rocket with a satellite into space.
Pro Charming old school graphics
While not the most technically advanced graphics the look of the game is much like a game from the 90s but seeing it in action when an assembly line starts moving there is an impressiveness to it that suits the game quite well.
Cons
Con Slow development prone to setbacks
Project Zomboid development has been going on for several years now and has hit quit a few snags that have set back its full release.
Con Weapon and weapon crafting systems could use some work
The weapons (mostly guns) in the game could use some work. They are oversimplified compared to the rest of the mechanics in the game.
For example, to repair used guns the player uses other guns, which feels wrong. It would make much more sense to use cleaning kits to maintain them.
Con Difficult
Survival in Project Zomboid is pretty difficult, which makes advancing in the game something to be relished when accomplished.
Con Can become rather repetitive
There's really little payoff for being able to build really long chains of automation, it usually results in being able to open a new tech tree which allows the player to continue the process of building automation chains ad infinitum, which, admittedly can become rather boring after a while.
Con Still in Early Access
The game is still in Early Access which means there will be bugs as well as missing features.