Planetbeing wrote an outstanding post on the simularities and differences on pwnage, quickpwn, and ziphone. It is a very interesting read. The original post was here but you can read it here as well (posted with permission).
Similarities
Jailbreak
Both utilities jailbreak.
Payload medium
Primary jailbreak payload is placed into iPhone memory for both jailbreaks
Differences
Technique
ZiPhone uses, as the root filesystem [...]
Ziphone Warning
“But Ziphone works fine for me? Why should I avoid it?”
I hear this all the time. It’s simple. Ziphone does permanent changes to your phone. Zibri is a terrible coder that stole most the exploits for ZiPhone and did not create them. Zibri admits that he cannot code. Ziphone does work most of [...]
Big warning to any ZiPhone users. Zibri’s WiFi fix is extremely dangerous. It hard codes your WiFi adapter’s MAC address to “00:5a:49:42:52:49″. This is ASCII for “Zibri”. This will cause major networking issues. All network cards sold are guaranteed to have a unique MAC address. It’s the lowest layer of how packets are routed. Now [...]
There are so many ways to jailbreak your 1.1.4 iPhone: Ziphone, iPlus, iLiberty, Independence. Which is the best method? Which is the safest? I’ll try to analyze each of these methods and make some recommendations:
Ziphone
This is the first method that was released. It runs on both OSX and Windows, and it generally works. [...]