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For me it's a swings and roundabouts discussion. Each has some advantages and disadvantages. Here are some pointers to some research / background that should help you decide between them: A comparison of current approaches to usability measurement. SUS: A Retrospective A Comparison of Questionnaires for Assessing Website Usability (and if you go for SUS ...

I think the SUS has more value as a benchmark that you set for the product and try to improve on, rather than compare against a competitor's product. This is because different products will have different strengths and weaknesses, and the SUS just doesn't provide enough detail for you to make in-depth analysis. If there's anything that seems to be a ...

While you might not be able to make direct comparisons between two systems, the SUS does provide a benchmark that you can use to make comparisons of the same system at different time periods. The key with SUS is that it provides an overall measure of system usability without making very specific distinction between the factors that contribute to usability, ...