Permanent redirect would be the best option from a SEO point of view. However if you are considering redirecting the entire website which was resident on the old URL to the new URL, it can get a bit tricky if the directory structure is not the same. There would be multiple pages and depending on the size of the website it could entail some hard work. If the directory structure is the same then it should be a cake walk. Hope this helps.
hello cnvseo, I visit your site and these are good site and i have web design related website if you want our site link exchange send your site details but i before you remind i have not pr link page but i have good and google index page. and i want some quarry--- what is the 301 redirect method if your full details plz tell me. Thanks in advance.