It depends. In general, a Utility or full application is preferred, as it is generally more thorough, researched, considered, and carefully prepared. Further the Utility application should have drafted claims and is written in an appropriate form to provide maximum protection. Nevertheless, since the Utility application generally takes several weeks to months to prepare, and costs several thousand dollars to prepare and file. Therefore the Provisional Patent Application (PPA) is often used to fulfill an important need – rapid, reasonably priced initial filings. The PPA is a great tool to help an inventor grab a priority date cheaply and quickly, without which many filings would not be possible. However, a PPA, if not drafted properly, can provide inadequate cover and many complications down the line, so care should be taken to file carefully considered and technically complete disclosures at this stage as well.