When comparing Leadwerks Game Engine vs AppGameKit VR, the Slant community recommends AppGameKit VR for most people. In the question“What are the best game engines for Virtual Reality development?” AppGameKit VR is ranked 2nd while Leadwerks Game Engine is ranked 10th. The most important reason people chose AppGameKit VR is:
AppGameKit VR allows you to use AGK's Tier 1 basic syntax or Tier 2 with Visual Studio C++. It greatly simplifies interacting with the HMD and controllers, yet is still flexible.
Specs
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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 Easy to use
AppGameKit VR allows you to use AGK's Tier 1 basic syntax or Tier 2 with Visual Studio C++. It greatly simplifies interacting with the HMD and controllers, yet is still flexible.
Pro Supports Steam VR devices
Vive and Oculus Headsets and Touch devices supported.
Pro Royalty Free
You can use AppGameKit VR commercially without paying any royalties
Pro Ready to use examples with 3D modelled hands
Even better with Leap motion.
Pro Leap motion support works fine
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
Con It is paid
Several other engines are free, this one costs $29.99.
Con Needs SteamVr on Windows
