When comparing Space Engineers [Early Access] vs Kerbal Space Program, the Slant community recommends Kerbal Space Program for most people. In the question“What are the best Simulation games on Steam?” Kerbal Space Program is ranked 6th while Space Engineers [Early Access] is ranked 20th. 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 Easy to build
Space Engineers makes it easy to build any items or objects making sure any skill level can easily have fun in game. All one needs to do is select what they would like to build from the menu and then choose the parts they would like to add.
Pro Destructible ships
Players are able to smash ships into each other with satisfying destruction physics.
Pro Prefabricated ships available in game that are modifiable
For those that do not want to build a whole ship from scratch there are prefabricated ships available upon start that are also modifiable so users can customize to their liking.
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 Servers are a "lag hell"
Due to the nature of physics simulation of custom built ships, the game requires top hardware to host the game, still making it a "lag hell" if there are more than 10 players.
Con Still not a whole lot to do
Being an early access game there is still a lot of missing features such as missions, thus leaving no much to do other than the free building mode.
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.