When comparing 7 Days to Die vs Factorio, the Slant community recommends Factorio for most people. In the question“What are the best singleplayer games on Steam?” Factorio is ranked 4th while 7 Days to Die is ranked 60th. 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 Constant sense of vulnerability, which keeps the player alert and on edge the whole time
As the player makes progress in the game by interacting with the environment, killing zombies or building things, they are rewarded with skill points that can be used to unlock new skills such as combat strength, higher stamina or new crafting options.
But even though the skill system can seemingly make the game easier, the severity and size of the zombie hordes will keep increasing with the time spent in game and the progress made by the player, keeping them on the edge and making them feel a constant pressure that an attack may come at any time and that they should be prepared.
Pro Robust crafting system that allows the players imagination to run wild with possibilities
Create everything from a chainsaw to various guns to defenses for your fort - the crafting system lists what you can make with the materials you currently have in the player's inventory.
Pro What you build is not only for creativity, but also for gameplay purposes
In 7DTD players don't build their homes only as bases or places to sleep in, or build cool looking things just for the fun of it and to test their skills.
Every 7 days, a large horde of zombies will attack the player wherever he or she is, trying to destroy them and what stands in the way of the player and the horde. This is why the player needs to think about how to build traps that will help them kill a lot of zombies and how to make a strong enough house that will not be destroyed easily.
Pro Randomly generated open worlds makes for a ton of replayability, as each playthrough is never the same
Recently added in the Alpha 9 release, randomly generated worlds allow the player a new play experience every time they open up the game. This means every server will have a different dynamic based on their layout of the world.
Pro Great replayability
No matter how many times you start a new game (random gen) you will never get the same experience. The crafting is the same, enemies are the same, game mechanics are the same but the gameplay is not. If you add the mods available for this game then you will have a whole new experience with added/altered crafting, different enemies, more quests etc...
Pro Single, co-op, and multiplayer gameplay modes give plenty of choice as to how one would like to tackle the game
Three different play modes including solo, with friends, or competitively over the internet gives a lot of choice as to how someone would like to play the game. Be it with friends or solo, the options are there.
Pro Unique combination of voxel and polygon models, which makes for pretty fun physics
The game is a mix between a voxel world and full polygon models for buildings, making for a versatile survival based world that brings exploration and creation to the zombie survival genre.
Structural integrity is a real thing in 7 Days To Die. That means there cannot be unsupported floating blocks. The player can set up traps to take out hordes of zombies with a falling building.
Weapons will break and crumble but can also be forged to be awesome, and the player must cook and maintain supplies.
Pro Creative mode gives the player a section to just trial things out in, for fun
The game allows players to make custom maps without zombies attacking to set up scenarios or make player made game types.
Pro Thoughtful and communicative developers allows for a stable community that keeps growing
Even though this is not directly related with the gameplay, it's still important especially for indie and early-access games. The developers behind 7DTD have always been communicative and have heard what the community had to say time and time again, releasing patches with bug fixes and new features in a timely manner.
Pro Fully moddable
(WIP) The game should eventually be fully moddable.
Pro Low system requirements means just about anyone should be able to run the game
Everything is smooth and perfectly executed. Runs great on any machine, low requirements. This way anyone can run the game without worry of needing an expensive machine.
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 Out of touch Dev team
The developers constantly rework the game, breaking things that worked well while ignoring problems and community feedback.
Con Really laggy even on high end PCs
Can only get 20 fps on high settings, even on an PC with GTX 960 and Intel i5-4690k.
Con Currently in Early Access
While the game is currently selling for $24.99, it isn't actually finished yet, so there will be bugs. Be sure to adjust your expectations accordingly before making the investment.
Con Crafting system is constantly getting dumbed down
Even though 7D2D is supposed to be a hard survival game (and most of the time it is), the crafting system is getting constantly dumbed down with new releases.
For example, previously you had sticks, planks, and logs. Sticks could not be used to build huge wood log walls or frames. While now there's no more different kinds of wood and you simply punch a bush to get some wood.
Con People who dislike Minecraft will dislike this game
If you like Minecraft, you might like this game, a lot actually. But if you HATE Minecraft, you'll quickly realize this game is basically Minecraft with better graphics. It just downright sucks.
Con Randomly generated open worlds has no generation options
Randomly gen has no option to customize how it is generated (like in minecraft for example) and could make it quite problematic if you want to have a good map, as there is no way to know how good or bad the map will be. Random gen also make unrealistic hills and road that almost go up/down vertically with vehicle spawning in such way they seems to be floating.
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.