Let's say I could buy quitsmokingnow.com that matches my keyword phrase exactly or I can use an existing domain like productreviewblog.com? Then I can make a sub domain such as quitsmokingnow.productreviewblog.com. (these are purely examples)
Will it be easier to rank the domain with the keyword match or will it be about the same using the sub-domain? I am curious if this can be a cost saving move if you are wanting to build multiple sites. If I would have to work harder building backlinks with sub domains then I think it would just be worth it to stick to a regular domain keyword match.