The dhtmlXDataView is successor of dhtmlxFolders. The main difference between them is the way of templating. While folders was linked to XSLT, dataview uses plain templates , which are much more simple to write and maintain.

• better templating
• performance improvement
• true dynamic loading
• ready server side solution ( connectors )
• ability to edit items
• simple API

• you have stable working solution - there is no serious bugs in dhtmlxFolders, they are pretty stable and their support is not discontinued.
• you already have your server side code an custom xslt

Components using different APIs, you can compare samples of dhtmlxFolders and dhtmlxDataView - both components have set of samples, with exactly same final result.

4 XSLT files, which was provided with dhtmlxFolders can be replaced with types/ftypes.js - those are named templates for dataview, which provides the same look and feel.