Which is best illustrator or coreldraw?

illustrator or coreldraw both are same because they both are vector software and it is depend on the user for him or her to select the software as well the which is easy for him or her.

coreldraw can do the same work on less time than illustrator

Both are equally good. You can create wonders using any of these. Personally, I like Illustrator because of shortcut keys and it works better with Photoshop and After Effects.

illustrator