Apart from conventional factors for making purchase decisions, like the intended application, validation and price, there are a few other technical details to consider. Like other CAs, DigiCert also uses so-called intermediate certificates (ICAs) in order to issue TLS/SSL certificates. The ICA links a certificate to the trustworthy root certificate of the CA so that browsers and other applications recognize it as trustworthy.
When ordering DigiCert TLS/SSL certificates in AutoDNS, one can select which root or intermediate certificate should be used to sign the certificate. This has the advantage that the ordered certificate can be specifically adapted to the system on which the TLS/SSL certificate will be utilized later.
You can find an overview of the root or intermediate combinations offered by DigiCert in our Help Center.