With the more recent 7.0, CS and CS2, what you can do in Photoshop has encorporated much that you had to do in an illustration program. Now if you prefer, you are able to use Photoshop.

As far as ease of use, Photoshop is much easier.

Illustrator is a case of how not to select what you don't want.

Just because something is complicated doesn't make it good. Look at Xara, what can't you do and it is simple.