Based on our record, OpenLDAP seems to be more popular. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Honestly, the best docs are at openldap.org. I've read countless books and I don't think any of them are written well. I probably should write my own. Maybe when I retire :). Source: about 1 year ago
Zytrax has some decent ldap documentation, there's also some stuff at openldap.org. Source: almost 2 years ago
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