There isn't a definitive answer to this question. You should look at each home for its individual characteristics. Generally, older homes may be in more established neighborhoods, offer more ambiance, and have lower property tax rates. People who buy older homes, however, shouldn't mind maintaining their home and making some repairs. Newer homes tend to use more modern architecture and systems, are usually easier to maintain, and may be more energy-efficient. People who buy new homes often don't want to worry initially about upkeep and repairs.
You should receive the following documentation at closing: Settlement Statement, HUD-1 Form (itemizes services provided and the fees charged; it is filled out by the closing agent and must be given to you at or before closing); Truth-in-Lending Statement; Mortgage Note; Mortgage or Deed of Trust; Binding Sales Contract (prepared by the seller; your lawyer should review it); Keys to your new home.