Inkscape or Illustrator?

I do my designs on inkscape.
Is illustrator much better, or is it only better because of the AI files?
I find Inkscape much easier to work with, and its free..
What is the great advantage of Illustrator..?? Help :0

Thanks in Advance,
Creativitron

THE ADVANTAGES,
We can make everything vector whatever we wants we can do easily by cs5 ill.

THANKS.

i am using inkscape too. for me it is much easier compare to Ai CS5. inkscape is nice if you like minimal design in logo but if you want a 3d design, Ai CS5 is the best.

I use both .. err 3d use a real 3d app not Ai