When comparing Minetest vs Xonotic, the Slant community recommends Xonotic for most people. In the question“What are the best open-source games?” Xonotic is ranked 2nd while Minetest is ranked 13th. The most important reason people chose Xonotic is:
Open Source games are not always known for their high-quality graphics. This can often be caused by the games being designed by committee in that many different people may work on the graphics, even in the same areas, which can cause plenty of inconsistencies. Luckily, Xonotic does not suffer from this problem as the whole of the game has consistent looks that are actually quite impressive.
Specs
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Pros
Pro Easily customization through LUA mods
An easy to use lua API, and a large variety of existing modifications and games that can be downloaded and installed easily.
Pro Open Source
Pro Runs fast and clean
Runs on Low-End Hardware, runs Fast, Spartan on Memory.
Pro Cross platform
Can be played on Android, Linux, Windows, and macOS.
Pro Fewer griefers than Minecraft
The smaller community means fewer players, and that mean fewer griefers than on Minecraft.
Pro Built for plugins from the beginning
Pro It's Free
Pro Fun and thorough tutorial
There is a tutorial game that you can download that teaches you how to play Minetest in a fun and intuitive way. There are even collectable gems you can try to find in the tutorial.
Pro Impressive graphics, especially for an open source game
Open Source games are not always known for their high-quality graphics. This can often be caused by the games being designed by committee in that many different people may work on the graphics, even in the same areas, which can cause plenty of inconsistencies. Luckily, Xonotic does not suffer from this problem as the whole of the game has consistent looks that are actually quite impressive.
Pro Cross platform
Mac/Linux/Windows support.
Pro Many game modes
Includes all the expected options like Deathmatch and Capture the Flag, as well as more novel modes like Key Hunt.
Pro Fast-paced action
Pro Interesting weapon design (for an arena shooter)
All arena shooter basically use Quake or UT weapon system. However, Xonotic has an interesting variety of weapons (larger selection than most) with elements from both UT and Quake but added some of their innovative ideas. Some of the weapons have a bit of overlap and felt a bit forced, but other weapons really made the game stand out.
Pro Play easily online
At any time, you can find people playing on the net. No special configuration needed.
Pro Not demanding on the system
On integrated HD4600 graphics ~120 FPS on normal settings.
Pro Multiple floor levels gameplay
The game permits players to move across multiple floor levels, which permits more dynamic game play.
Cons
Con Lack of mobs
Yet mobs can be installed through mods or subgames. However, if the server is not optimized, these can make the game run slower.
Con Not much to do even with mods
All I do in the game is dig underground and mine the ore within the caves. There are no monsters to fight, dungeons to explore, or any leveling systems/progression mechanics to keep me playing.
Con No weather
There's no built-in weather. However, there are mods which add this feature and extend it far beyond what you might expect from basic weather.
Con Rips off Minecraft
And not very well either.
Con Certain graphics are really bad
Parts of the games's graphics and functionality are really bad. Mob mods or default mobs look like a 4 year old drew them. However, the devs seem to be slowly sweeping through these issues. Come back soon if you don't like what you see yet.
Con Server lags
Almost everything is done server side, so the game can feel very janky on some servers.
Con Minecraft mod ecosystem separate from Minetest
Minetest is obviously an opensource implementation of Minecraft but the only problem is all the mods made for Minecraft do not work in Minetest. They could have designed their clone in such a way say fix it at 1.7.10 forge so that you could load up forge mods straight up and have them work somewhat. There's so much great content for Minecraft that is completely lost and unusable in Minetest, however at this pace of developement, maybe that will change in the future.
Con Cannot be played on the Raspberry Pi
Con Campaign can be very hard and you can get stuck
Some levels are very strange and difficult like fighting with almost invisible enemies.
Even at easy they are hard to beat and you must beat them in order to progress in campaign.
Con Few players
Very few players on the servers ate as it happens 5-9 people!
Con Boring AI bots
Bots are not the most performant opponents in Xonotic. They often run around the same paths, and sometimes even stand still on spots for apparently no reason.
Con No actual addons repository
Cannot download custom maps through the actual game. Instead you have to download maps online and then put them in a directory.