When comparing Leadwerks Game Engine vs ApertusVR, the Slant community recommends Leadwerks Game Engine for most people. In the question“What are the best game engines for Virtual Reality development?” Leadwerks Game Engine is ranked 10th while ApertusVR is ranked 11th. The most important reason people chose Leadwerks Game Engine is:
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.
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 Embeddable
ApertusVR is not a framework. It's a set of embeddable libraries that can be integrated into your new/existing project.
Pro Framework-independent
You don't have to integrate your application into other frameworks. ApertusVR extends your product with AR/VR capabilities.
Pro Platform-independent
You can use different AR/VR devices, operating systems and platforms thanks to C++.
Pro Open-source
The open-source, MIT licensed code-base grants you full control of the source code.
Pro Network-topology independent
Use Server-Client or even Peer-to-Peer topology.
Pro Distributed
The configurable ecosystem provides you a wide variety of plugins for different computation tasks, that can be distributed among the computational participants.
Pro IoT supported
ApertusVR uses ApertusCore which is an abstract, distributed database to create ad-hoc networks and share data across participants.
Pro MultiPlayer
ApertusVR supports multiple participants in the same scene/space.
Pro Sharable
You can invite other users to join into the same scene/space.
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
