glTF: web-first
Compact, supports color/materials, loads fast online.

Both glTF and OBJ turn STEP geometry into a mesh, but glTF is the modern web format while OBJ is the simple universal one. Pick by whether you prioritize web performance and color or maximum compatibility.

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Compact, supports color/materials, loads fast online.
Simple and accepted almost everywhere.
glTF preserves it more reliably than OBJ.
You are displaying the model in a browser, configurator or AR/VR experience.
You want color and materials preserved with an efficient file size.
You need the broadest possible tool compatibility for a simple handoff.
Color fidelity is secondary to just moving geometry between tools.
glTF — its material support is stronger and more consistent than OBJ.
glTF/GLB is usually more compact for equivalent detail.
No. It remains a reliable universal format for simple interchange.