In a Reddit discussion from January 2019, it was asked if there is any benefit to a site’s rankings in using a particular type of SSL certificate.
After another user commented that the main concern was that they have a secure connection in place on the site, Google’s John Mueller confirmed that there is no difference from a ranking point of view:
Yeah, there’s no ranking boost for using any particular kind of certificate. Use whatever works for you. Use a free one if you want.
This backs up the point John made in a Reddit AMA in August 2018, in which he said:
we don’t differentiate between valid certificates for websearch.
This emphasises that the main concern from a ranking perspective for site owners should be that they have an SSL certificate in place, rather than worrying about which one to choose.