Use any registration and login solution with JReviews, including, of course, the native user systems in Joomla & WordPress.
With JReviews you continue to use the existing login and registration funtionality for Joomla and WordPress, because JReviews relies on the native user system. Any listing, review, comment, or media uploaded to JReviews will be associated with the Joomla or WordPress user that creates it.
In Joomla you can use the existing menu types for user login and user registration, as well as the Joomla core login module. JReviews core includes integrations with EasySocial, JomSocial and Community Builder will also work.
WordPress doesn't come with with front-end registration and login built-in. So you need to rely on 3rd party plugins that allow users to register and login via the front-end. JReviews core includes integrations with PeepSo and BuddyPress.
Another option to consider is the UserProfiles Add-on if you need a profile system without all the bells & whistles of a full blown social network. It comes with its own sign-up page and login functionality, and all of the listing features like favorites, reviews, inquiries, etc. also work on profile pages because these are regular JReviews listings.