When comparing Besiege vs Factorio, the Slant community recommends Factorio for most people. In the question“What are the best indie games on Steam?” Factorio is ranked 5th while Besiege is ranked 54th. 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 Beautiful design
Each level takes place on a stage of blank white, giving the users unlimited space to test machines. The destruction of machines, buildings, and NPCs in this game is graphic and hilarious.
Pro Encourages creativity
In each level, the player is given an objective. The objective can be reached in any way. Players are able to build a huge variety of custom weapons and vehicles. Potential vehicles include airplanes and helicopters, tanks, catapults, hot air balloons, and more.
Pro Active community
There are loads of forums where you can discuss stuff about the game, share creations and ideas and look for servers you can play on.
Pro Sandbox Mode and Multiverse (multiplayer and level editor)
Remember, it's not just levels! In the Sandbox you can test your machines which is neat. The Multiverse has a lot to offer as well: the multiplayer function and the Level Editor. You can upload your levels to the Steam Workshop (Steam only).
Pro Community Workshop (Steam only)
In the Workshop, you can post your creations for other users to use and you can download other people's creations.
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 Another one of them games forever stuck in Early Access
Con Still in alpha testing
Some of the best features of this game are still in development. The final version isn't said to be released until mid 2016.
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.