The question «which engine should I use?» comes up in almost every game development forum, and it nearly always gets passionate, contradictory answers. In reality there is no engine that is best in absolute terms: there is the one best suited to a specific project, and to a person or small team with specific skills. It is worth thinking it through before writing the first line of code, because changing course halfway through is very expensive.
What a game engine does
A game engine is a set of tools and libraries that solves problems common to almost every game:
- 2D and 3D rendering, with shaders, lights and materials;
- physics and collision detection;
- input from keyboard, mouse, gamepad and touch;
- audio, with mixing and source positioning;
- asset management: importing images, models and sounds;
- a visual editor for building scenes and levels;
- export to different platforms.
A framework, on the other hand, provides only part of these services, usually windowing, graphics, input and audio, and leaves the developer to organise the rest. Well-known examples are libraries such as SDL, raylib, LÖVE for Lua or MonoGame for C#.
The criteria that really matter
Type of game
A 2D pixel-art platformer and a realistic 3D shooter have completely different needs. Godot has excellent native 2D support, with pixel coordinates and tilemap tools. Unreal Engine excels at high-end 3D graphics, but for a small 2D game it is often overkill. Unity sits in the middle and covers both worlds well, with a very large ecosystem of extensions.
Programming language
It makes sense to start from what you already know or want to learn:
| Engine or framework | Main languages |
|---|---|
| Godot | GDScript, C# |
| Unity | C# |
| Unreal Engine | C++, visual Blueprints |
| LÖVE | Lua |
| raylib, SDL | C, with bindings for many languages |
GDScript has a Python-like syntax and is very quick to learn. C++ in Unreal offers maximum control but has a steep learning curve; Blueprints let you create logic without writing code, which is useful for prototypes and designers.
Target platforms
If the game must ship on desktop and the web, you need to check the quality of the HTML5 and WebAssembly export. On mobile devices, package size and performance on modest hardware matter. Consoles require licences and development kits supplied by the manufacturers, and not every engine offers the same level of support: this needs careful checking before you commit.
Licence and costs
Commercial terms vary widely and have changed several times over the years, so always read the current version on the vendor's site. Broadly speaking:
- Godot is free software under the MIT licence: no royalties, modifiable source code;
- Unity and Unreal have commercial models with revenue thresholds, subscriptions or royalties;
- open-source frameworks usually have no cost.
For a commercial project it is wise to also weigh the risk that terms may change in future. An open-source engine removes this uncertainty, at the price of a smaller commercial ecosystem.
Community and documentation
When you get stuck, what makes the difference is official documentation, up-to-date tutorials and forum answers. A popular engine offers more material, but watch the version: a tutorial written for an old release can be misleading after a major API update.
When a framework or your own engine makes sense
Writing a game with a lightweight framework is an excellent learning exercise: it forces you to understand the game loop, collisions and resource management. It is also a sensible choice for small games, games with a very unusual mechanic, or games aimed at limited hardware.
Writing a complete engine, however, is a project in its own right. If the goal is to release a game, a home-made engine risks swallowing all the time available. In my work I have learned to keep the two things clearly apart: building tools is fascinating, but it should not be confused with finishing a product.
A method for deciding
A concrete approach is the comparative prototype:
- Pick two realistic candidates based on the criteria above.
- Define a minimal but representative mechanic: a character that moves, jumps and picks up an item.
- Build it in both, with a time limit, for example one weekend each.
- Export it to the target platform and try it on the real device.
- Note where you got stuck, how easy it was to find answers, and how the editor workflow felt.
This test reveals more than any feature comparison.
Common mistakes
- Switching engines every time you hit a difficulty: every engine has its problems.
- Ignoring version control: scenes and assets should go into a repository from day one.
- Underestimating export: test it early, not a week before release.
In short
- There is no best engine overall, only one better suited to the project and the skills involved.
- Game type, language, platforms, licence and documentation quality are what matter.
- Always check licence terms in their current version.
- A lightweight framework is great for learning and small games; a home-made engine is a separate project.
- A short prototype in two engines is worth more than any comparison table.
