The top alternative after Unity's 2023 controversy. Users switch for 100% free and open source with MIT license—no royalties, no fees, ever. Gain: faster prototyping, lighter engine, better 2D tools, no licensing surprises. Trade-off: weaker 3D than Unity, smaller plugin ecosystem, no official console support.

AAA developers switch for superior graphics (Nanite, Lumen) and predictable royalty model. Gain: photorealistic visuals, free until $1M revenue, massive marketplace. Trade-off: steeper learning curve, C++ required for performance, heavier hardware requirements.

2D developers switch for purpose-built 2D tools and simpler workflow. Gain: excellent 2D support, GML is easier than C#, proven track record (Undertale, Hyper Light Drifter). Trade-off: limited 3D, smaller community than Unity.

Mobile-focused developers switch for smaller build sizes and King's backing. Gain: lightweight engine, excellent mobile performance, completely free. Trade-off: smaller community, less documentation, primarily 2D focused.

Non-programmers switch for no-code/visual scripting game creation. Gain: no programming required, fast prototyping, good for HTML5 games. Trade-off: limited to 2D, less powerful than Unity, subscription model.