My ibot pro works great along with coolcam x software. OSX Jaguar even has built in support for ibot pro, but the picture quality is not better than ibot's native driver. It does not trip easily despite what Macworld says that Orange Micro's iBot Pro has a quirkier and less functional base unless you move around your cam alot.
I have not work with pyro 1394 webcam, so i can't tell you the difference. But the ibot seems to be a good choice though.