I find working in BricsCAD very similar to AutoCAD. For the dynamic blocks would just replaced them with the BricsCAD version or just stick to standard blocks. In terms of clarity I don't see any differences.. The AutoCAD UI is a bit nicer, it AutoCAD Map offers some features BricsCAD doesn't if you don't user them it wont make a difference for you.
It feels 100% natural… very similar to using AutoCAD.
Common commands they are nearly identical … you also have the ability to define the alias just like in AutoCAD(pgp file). Load custom menus /toolbars (mns). Load Custom Lintypes(lin)..
I would research more about what tools you depend on?
What Commands?
importing, exporting tools?
Cleanup tools?
And cross check to ensure BricsCAD covers that adequately.