When comparing Alien Swarm vs FlightGear, the Slant community recommends FlightGear for most people. In the question“What are the best free (No F2P!) games for PC?” FlightGear is ranked 17th while Alien Swarm is ranked 19th. The most important reason people chose FlightGear is:
FlightGear has scenery that contains environments to fly in from the whole globe.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Easy to pick up and play, even for beginners
The game consists of tried-and-true top-down shooter mechanics that will be familiar to most players; it is reminiscent of older arcade and console shooters.
Pro Anyone can download and play the game as it is free-to-play and open-source
The game is completely free and has no microtransactions or ads.
The source code is also free and accessible, so the game can be easily modded.
Pro Easily play with up to 4-players in online co-op
Alien Swarm allows for up to 4-player online co-op, which makes for an easy way to play with a small group of friends or strangers.
Pro Convenient offline LAN support
Alien Swarm offers offline LAN (local area network) support, meaning that the game can be easily played locally with each machine connected together in the same place.
Pro Worldwide scenery
FlightGear has scenery that contains environments to fly in from the whole globe.
Pro Free and Open Source
All code written for FlightGear is opensource and available for anyone to use.
Pro Crash animations in some aircrafts
Pro It has world-wide multiplayer
Pro Live cockpit
Pro A lot of aircrafts to add
Pro It has amazing graphics
Pro You can almost recreate real incidents
Pro No bugs
Cons
Con Can get a bit repetitive
The gameplay doesn't change much from mission to mission; you’re generally just shooting aliens over and over again.
Con Gameplay is too short
The main story only takes about three or four hours to complete, which means you could beat the game in one sitting pretty easily.
Con Not as graphically advanced as commercial competition
Con Getting stuck upside down
After a crash a pilot may be stuck in an upside down position with no way to recover.