My experience with both Acad & Bricscad is on quite old versions, Bricscad V15 & Acad 16, so my knowledge of differences is quite rusty. One key thing I like about Bricscad is that I can batchplot or batch process multiple drawings from one currently open drawing. Meaning run a lisp that opens files, plots, modifies, etc, then close the file, returning to the file that ran the lisp. When I learned this I could abandon my old batch plot method of writing script files to do the processing.
Other key differences is that I previously had lots of code that used express tools subroutes (acet..), which Bricscad didn't have.