When comparing Leadwerks Game Engine vs CopperCube, the Slant community recommends CopperCube for most people. In the question“What are the best game engines for beginners and non-programmers?” CopperCube is ranked 17th while Leadwerks Game Engine is ranked 20th.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Versatile flow diagram script model
Leadwerks's flowgraphs resemble flowcharts where each box represents a function or value, with connections between them representing program flow. This provides a better at-a-glance indication of game logic than a simple list of events, and makes complex behaviors easier to accomplish.
Pro Built-in level editor
Has an acceptable 3D map editor that is easy to use.
Pro Handful of Prefabs and Scripts
For example, you take a model (e.g. torch), add a light source to it, add a particle generator (for fire) and save it as a prefab (one file). Then this prefab can be used to add many torches with fire and light.
Pro Allows creating 3D apps and games without programming
Pro Good 3D editor
Includes easy to use 3D editor for quickly clicking together 3D games.
Pro Native WebGL support
Can create 3D games as real WebGL apps, running inside websites. Doesn't use a cross compiler, so WebGL apps are small and download quickly.
Pro Good terrain editor
CopperCube includes a terrain editor. Terrain can be drawn with height painting tools directly in the editor, textures can be painted quickly with automatic texture blending into the terrain. There are also tools for placing grass and bushes, and for distributing meshes automatically over the terrain.

Pro Exports to irrlicht
It was also written by the founder of irrlicht, although it is not open source.
Pro Available on Steam
CopperCube is available on Steam It was Greenlit.
Pro Easy to learn and to use
Pro Fast prototyping
You can quickly develop an experimental working model of the product (prototype), because the engine gives you access to a lot of prefabs, plugins and settings. And, you can use the visual programming to speed up the process, even if later you have to write code in order to improve the final product.

Pro Oculus Rift support
Supports both DK2 and DK1.
Cons
Con Very buggy
Leadworks is a not complete, it's a work in progress. As such many parts of the engine are clunky, especially the level editor.

Con Documentation and support are limited for non-coders
The flowgraph editor can be used with free script assets to build games without writing any code, but this is not directly intended or encouraged by Leadwerks.
Con Highly misleading advertising
