Leadwerks Game Engine is the easiest way to build 3D games. With a rapid development pipeline, support for Lua and C++ programming, and plenty of learning materials, Leadwerks is the perfect way to learn to make games.
I have worked with Unity and Leadwerks engines, I find leadwerks to be the better for user friendliness and coding in LUA and C++ are the industry standards and you can use these in the engine.
Leadwerks is in constant development and the developer is in close contact with the users of the engine making sure you get what you want included in the engine in the long run.
For the small layout you get a royalty free engine, what more can I say.
I have to add that the features of leadwerks have to be desired and with no clear road map for development it is unclear what will and will not be in the final product.
Although updates are coming out for the engine it is slow, with all the sales of the engine you would think that more people would be hired to speed up the development since it has been on the go for such a long time.
This engine has potential but for the full price it just is not worth it and is sold as a complete package an "easy engine" but with broken scripts supplied with the engine like the FPS char and AI scripts I would look at skyline game engine.