Swastika

I use 3DS Max for the modeling process and/or for the rendering process. I find it has great support for the Archviz industry. It supports files from Revit, Autocad, Sketchup which makes it easier to start your project if needed.
Datasmith is an another excellent addition to the software, which allows my to export all of your 3D scene (including shaders, lights, and camera) inside Unreal Engine.
For the texturing process, I like to use Substance Painter, especially with the live-link for Unity and Unreal, giving you instant feedback in your scene.
Substance Source comes in handy because of the variety of materials, the automotive materials are my favourite.
My other weapon of choice is Substance source, they have a massive library of material delivering excellent results in renderings.
Definitely a must have tool especially when it comes to environments, although they are starting to focus on Game Props/Archviz as well which is great !