When comparing 0 A.D. vs OpenRCT2, the Slant community recommends 0 A.D. for most people. In the question“What are the best open-source games?” 0 A.D. is ranked 6th while OpenRCT2 is ranked 40th. The most important reason people chose 0 A.D. is:
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.
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 Expands on the original game
This game expands on the original game by fixing bugs and removing limitations.
Pro Higher & widescreen resolution options available
It even supports high DPI displays.
Pro Online multiplayer mode added
Unlike the original release OpenRCT2 lets you play online with others.
Pro Supports Linux & Mac
The original RCT2 game was written in Windows assembly so it would only run on Windows. OpenRCT2 can be played on Linux or Mac natively.
Pro Uncapped FPS
The original game is capped at 40 FPS - it was written in assembly and it's from 2002 but with similar engine from the original from 1999 - but with OpenRCT2 you can remove this and play uncapped giving much smoother animations, transitions and camera movement.
Pro Auto-save feature added
Should your computer shut off unexpectedly, the auto-save feature ensures you don't lose your glorious park completely.
Pro Game engine now does hardware rendering
The original game only had software rendering, OpenRCT2 allows hardware rendering.
Pro More languages supported
OpenRCT2 allows to translate the game in any language. Expanding from the original 6 languages to 20 as of version 0.0.8.
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 Requires original Roller Coaster Tycoon 2
Quoted from its home page "An installation of RollerCoaster Tycoon 2 is required in order to play. RCT2".