Hi @hib,
Let’s Encrypt only offers DV certificates, not OV or EV certificates. That means that the certificates don’t include verified information about the legal identity of the organization that uses them. (Let’s Encrypt doesn’t have an automated way to check that information; it would have to be checked offline, which would cost money.) However, the cryptographic security of the user’s connection to the site is the same.
Some businesses may feel that an OV or EV certificate is better for their needs. As far as I know, it’s not required by any regulations and there isn’t strong evidence that most end-users regard it as more trustworthy or commonly check the identity information. Quite a lot of businesses have been OK with our DV certificates for their business sites so far. In particular, a DV certificate is OK under the PCI rules for a site or service that accepts credit card numbers.