When comparing Besiege vs Kerbal Space Program, the Slant community recommends Kerbal Space Program for most people. In the question“What are the best indie games on Steam?” Kerbal Space Program is ranked 8th while Besiege is ranked 54th. The most important reason people chose Kerbal Space Program is:
The physics engine does a reasonably accurate job of replicating the fundamentals behind both orbital dynamics and rocket design, so by going through the tutorials and experimenting, you're actually learning some real rocket science.
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 Teaches orbital dynamics & rocket design fundamentals in an accessible manner
The physics engine does a reasonably accurate job of replicating the fundamentals behind both orbital dynamics and rocket design, so by going through the tutorials and experimenting, you're actually learning some real rocket science.
Pro Tons of stuff to do
Build rockets, space planes, space stations, rovers, landers, probes. Explore planets, moons, capture asteroids, set up a communications network, colonize a planet, mine for resources and much more. It can even simulate our solar system.
Pro Huge modding scene
There's a plethora of mods available that can change every single aspect of the game.
Pro Excellent construction sandbox for building and launching rockets
KSP at its core is a rocket building and launching sandbox. When creating a rocket you can place engines, fuel cells, structural elements, and even parachutes, allowing you to build a rocket in any shape and size. The end result can even look like a giant doughnut, which might be difficult to get it into outer space. Even if you fail, the entirety of the process is really enjoyable.
Pro Motivates you to learn
Kerbal Space Program puts into perspective how amazing the advancement of the human race is. It inspires you to learn our history, how we got here, and what we can do proceed.
Pro In constant development
KSP is a shinning example of early release done right. The currently available game is fun to play, and the developers are constantly adding new major additions.
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 Some visuals are poorly done
While the rockets, buildings, and even the Kerbals look pretty good, the environments and particle effects are a bit lacking.
Con Steep learning curve
Kerbal Space Program is not really a pick up and play title. It can take hours just go grasp the basics and the game will keep throwing new concepts at you as you progress into space, even stuff like orbital dynamics. Because of this, it can easily take dozens of hours to truly master this game.