Not much. They are all recognized around the world and can be used to signify certifications across each agency. If you get your SSI Open Water Certification with us, you can still take specialties with other agencies.
For us, working with SSI, Scuba Schools International, means that all our dive instructors have to be affiliated with our store.
If you have any questions about transferring specialties to your SSI profile, what the different agency’s levels mean, or anything else, let us know!