When comparing Star Citizen (still in development) vs Kerbal Space Program, the Slant community recommends Kerbal Space Program for most people. In the question“What are the best Space Sims on Steam?” Kerbal Space Program is ranked 1st while Star Citizen (still in development) is ranked 6th. 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
Ranked in these QuestionsQuestion Ranking
Pros
Pro Includes a singleplayer mode, called "Squadron 42"
Squadron 42 is a single player campaign that takes place in the in game universe that allows players to play offline.
Pro Over $73million in funding
A game with the huge scope of Star Citizen will cost a lot of money to develop, and through multiple campaigns, Star Citizen has raised a huge amount of money to make that happen.
Pro Vast, detailed sci-fi world
A long term goal is to have over 400 different star systems in game, most of which will have many planets within them.
Pro Ability to command persistent ships and stations
Players will be able to command multi-person ships with other users who will be able to command their own stations on said ships.
Pro Dynamic economy system
The economy of the game and the actions to keep it moving are constantly going on in the background but allows for players to step in and out of it at their leisure in order to take part.
Pro A true PC game
It's been stated that the game will take full advantage of PC's capabilities and will not be held back by a need to accommodate a console port.
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 Commercial launch is still a year away (2016)
The commercial launch of the persistent universe game will be sometime in 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.