1. CAD interface
BricsCAD interface has some unique features which requires some efforts to learn. For example, the options dialog box is replaced by a Settings panel.
2. Lisp/Macro support
BricsCAD supports Lisp code (.lsp) and VBA (.dvb) directly from AutoCAD
ZWCAD only supports Lisp code (.lsp) directly from AutoCAD.
AutoCAD has a 23-year super forum and AUTODESK has 101 more forums for other categories.
BricsCAD has an acitve Forum while ZWCAD NOT