So now, with 2.79, there are two architecture addons.
- Do they serve different purposes?
- Do archipack replace archimesh?
Archimesh basically is a collection of existing cad addons packaged and extended by Antonioya. (window maker, door maker, a wall generator, blinds..)
Archipack is a framework intended to provide parametric objects developpers a fast and easy way to program, focusing on mesh generation, and providing on-screen real-time manipulation, native preset and material handling, and strongest support for linked objects.
Inspired by archimesh, current implemented objects are ment to boost users productivity with a fast and reliable way to get "ready to render" models.
See Archipack wiki