I wouldn't publish anything on article directories period if you are doing it only for SEO benefits. Waste of time.

Otherwise, I would put the content on your site first, and make sure it is indexed. Otherwise Google may index one of the versions on an article directory and push yours to the supplemental SERPs.

The only benefit of article directories is the calories you'll burn submitting the articles.Oh, and probably the calories you'll burn after seeing your rankings plummet with the next penguin refresh.

Other than that, don't waste your time.

yes on unique, no don't publish after on your site, but in general article directories are a spam target and I wouldn't use time to submit to them anymore. Have a look around for some fresh link building tactics.

Yes, you publish your unique content to article directory.

Avoid article directories. There are no article directories worth submitting to now. They are all 'dead'. Use web 2.0 sites instead like Squidoo, Hubpages, Buzzfeed, etc.

I may be unique or Not but your link should be visible, not redirect from that to your site.

First publish on your site and then use the spun version on article directories otherwise you will fall under googles update.....