When comparing 0 A.D. vs Kerbal Space Program, the Slant community recommends Kerbal Space Program for most people. In the question“What are the best games on Linux?” Kerbal Space Program is ranked 11th while 0 A.D. is ranked 16th. 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 Free, Real-Time Strategy title actively being developed
Still currently in development, 0 A.D. is currently in Alpha stages and completely free. For those willing to wade through the multiple bugs, essentially testing the title, this game will scratch the itch of any RTS fan on a shoestring budget.
Pro Multi-platform support
The game will run on any Operating System, whether it be Linux, OSX, or Windows, which is great for people who dual-boot or use multiple OS's across their devices. No matter the OS used, one can install and play this game.
Pro Addictive Age of Empires style gameplay
This game can be seen as a spiritual successor to Age of Empires, thus it will provide similar gameplay to those who are familiar with the AoE series.
Pro Straightforward RTS gameplay
0 A.D. brings recognizable, straightforward, Real-Time Strategy gameplay to the players. With a mini-map in the bottom corner, resources shown in a bar at the bottom, and unit selection through double clicking, all of the major elements found in most RTS games is here, making for a very familiar game for those that are used to the genre.
Pro Code is open-source
Even if the current developer team chooses to no longer work on the game, others can keep contributing to the source code and modify it.
Pro Active development
By being in active development the game allows for frequent bug fixes as well as frequent new content. While it is still in alpha, the state of the game playability is pretty good with new features being added all the time.
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 Currently in alpha
0 A.D. is an ongoing open source project that is as of yet feature complete.
Con Slow development
0 A.D. is an ongoing open source project that is as of yet feature incomplete. This game is still in Alpha version 23 Ken Wood as of September 2020.
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.