Registry redirect, or 301?

I have a site that after one years time, google and the other engines do not want to give up.

Long story short, I moved my business, all files, folders, images etc.. from one domain name to the other domain name in Jan 2006.

After approx. one year later google still shows my old .ws site's homepage as my most recent cached homepage for my new .com site in my google sitemaps account!

should i just do a registry redirect to take care of this?

or should i setup a 301 redirect?

Quite frankly just to be safe I'd throw up the 301 in your htaccess file yourself.