PDF Creator, like Bullzip, functions as a PDF printer, taking instructions sent by the print command and interpreting them to create a PDF document. The program allows for image compression, digital signing, encryption, and a slightly more limited signing mechanic. PDF Creator allows for export into a variety of formats as well as PDF, and, interestingly, supports installing on server, an edge over Bullzip.
Verdict: While we give Bullzip an edge on features, PDF Creator's ability to be installed on a server is a marked advantage if you need a bigger deployment solution.
Note: PDF Creator is bundled with Open Candy, which will attempt to add extra software during installation, so keep an eye out. PDF Creator can also include the free PDF Architect software in its installation, though we hadn't yet had time to give it a look at time of print.