AI and CAD can be compared? They are completely different industry-oriented software, there is no comparison.
One does graphic design and layout, and one does drawing design.
Each has its own advantages, according to their own needs to choose which software to use.
Computer Aided Design (CAD-Computer Aided Design) refers to the use of computers and their graphics equipment to help designers design work. In the design of the computer is usually used to carry out a large number of calculations, analysis and comparison of different programs to determine the optimal program; a variety of design information, whether digital, textual or graphical, can be stored in the computer's memory or external memory, and can be quickly retrieved; designers usually start the design with sketches, the sketches into a working picture of the heavy work can be handed over to the computer to complete; by the computer automatically produces the design results, you can quickly make graphics, so that designers can make timely judgments and modifications to the design; the use of computers can be edited with graphics, zoom in, zoom out, pan, copy and rotate and other related graphic data processing work.
Adobe illustrator is a kind of software applied to publishing, multimedia and online image of the industry standard vector illustration, as a very good picture processing tools, Adobe Illustrator is widely used in printing and publishing, poster book layout, professional illustration, multimedia image processing and the production of Internet pages, etc., but also for the line drawings provides high precision and control, suitable for producing any small design to large and complex projects.