Three key differences apply.

Examination. Utility models undergo only preliminary examination, without substantive review for inventiveness. As a result, they are granted faster but carry relatively weaker validity, and face a higher risk of being challenged through invalidation in litigation compared to invention patents.

Subject matter. Utility models protect only a product's shape, structure, or a combination of the two — processes, material formulations, and software algorithms cannot be protected through a utility model.

Term. 10 years for a utility model, 20 years for an invention patent.

Whether to pursue a dual-filing strategy depends on three considerations: Is the product life cycle short, and do you need an enforceable right quickly — before a trade fair, say, or a major e-commerce sales event? If so, dual filing usually pays off; Is the inventive step clearly sufficient, and is this long-cycle core technology? An invention application on its own may then be enough; Is this a structural improvement you expect to enforce in the near term? Leading with the utility model and following with the invention patent is the usual combination. Each application must state at filing that the other has been filed for the same invention on the same day, and only one of the two can be kept once the invention application is ready to be granted.