Unity or Unreal for mobile, VR and simulation

Both engines can build almost anything the other can. Arguments about which is "better" are close to meaningless without a target platform, a team and a budget. The useful comparison is where each stops being convenient.

Mobile is where they differ most

Unity's advantage on mobile is real and mostly structural. Minimum build sizes are smaller — meaningful when a store download limit over cellular decides whether someone installs. It runs acceptably further down the device range, which matters in markets where mid-tier Android is the bulk of the audience. And iteration is faster: entering play mode takes seconds rather than waiting on shader compilation.

Unreal on mobile has improved substantially and produces excellent results on flagship hardware. But you will spend real time on build size and on scaling down rendering features that are enabled by default, and you will lose lower-end devices you might have kept.

If your target is broad Android reach, this usually settles it before anything else is considered.

VR splits by content type

For VR the deciding factor is which headset.

Standalone headsets — Quest and similar — are mobile chipsets with a punishing frame budget, and you must hold framerate or users feel unwell. Unity's mobile heritage and lighter default footprint make hitting that budget easier, and the majority of standalone titles ship on it.

PC-tethered VR for high-fidelity visualisation — architectural walkthroughs, design review, high-end simulation — is where Unreal's renderer and material system earn their reputation. If photorealism is the product, Unreal gets you there with less custom work.

Industrial simulation and large worlds

For large-terrain, many-entity simulation, Unreal's tooling is more mature out of the box — world partitioning, level streaming, and a rendering pipeline built for scale. Its data-driven and visual-scripting workflow also lets domain experts who are not programmers adjust behaviour and scenarios directly, which matters on training projects where subject-matter experts drive the content.

Unity is entirely capable here, particularly with its data-oriented stack for high entity counts, but you will build more of the supporting scaffolding yourself.

Team and hiring

This is the factor teams weigh least and regret most.

Unity uses C#, which is approachable, widely known, and shares a talent pool with general application development. Unreal uses C++ alongside Blueprints; strong Unreal engineers are scarcer and cost more, and C++ is less forgiving of a team learning on a deadline.

If you have an existing team, their engine is very likely the right engine. Retraining across this boundary is not a sprint.

Licensing, plainly

Unity charges per-seat subscription tiers, with the free tier limited by your revenue. Unreal is free until a revenue threshold, after which a royalty applies on gross product revenue.

For a client-funded project delivered to a customer — training simulation, industrial visualisation, a configurator — subscription costs are predictable and royalties usually irrelevant. For a self-published title with real commercial upside, model both properly against your revenue forecast; the answer flips depending on scale.

Both companies have changed licensing terms in ways that surprised developers. Whichever you choose, read the current terms rather than what was true when you last looked.

How we actually decide

In order: What hardware must this run on, and what is the weakest device we must support? Is photorealism the product, or is responsiveness? Who will maintain this in two years, and what do they know? What does the licensing cost at our realistic revenue?

By the time those four are answered the engine is usually obvious, and the remaining preference is not worth arguing about.

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We build games, XR and industrial simulation in both engines, and we recommend against the one we would enjoy more when it is the wrong fit. See our game development and XR work, or tell us what you need to simulate.