China recently issued a performance standard for the BeiDou Navigation Satellite System (BDS). It is available at http://en.beidou.gov.cn. I took a quick look comparing the BDS Open Service Performance Standard to the GPS Standard Positioning Service Performance Standard and here is what I came up with:
I coded the table to show green for the GNSS service committing to a more stringent standard over the other. As we see, each has commitments that better the other, depending on the category. Furthermore, BeiDou is not currently offering a global service, but rather a regional service for China and surrounding neighbors, based on its limited constellation size. I also note that these are commitments only. Actual performance varies. For assessments of GPS performance, visit http://www.nstb.tc.faa.gov and read their quarterly Performance Analysis Report and GPS Monthly Report Card.