Illustrator vs Corel Draw vs Inkscape vs Xara Xtreme

Hello! Welcome to open discussion.
There is old opininion that professional use only Adobe Illustrator or Corel Draw, that these are the only choices.

But there are Xara and Inkscape - cheaper or freeware options.
Both have been developed for a long time.

Are they good enough to work on them to create professional illustrations, logos, etc ?
What do You think about that ? What are Illustrator advantages over these younger cousins ?

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