**************** - Backlinks to the same domain

I know this is generally a bad idea if avoidable, but if you have a high PR site that you can get higher pagerank links that is a do-follow I have to ask the question. Im getting savy at Scrapebox so I have the option to get either of these ...

Would it make sense to post on multiple blogs on the same domain (ex. PR 5) to get high quality back links or would it just be safer to go the route of posting on a variety of domains with various PR - given both options allow for do follow comments?