Jackiebalboa,
i dont think that the G11/12 is better because it's a Canon. This cameras are a class of it's own as they have external controls like a DSLR but in a small housing, unleashing creativity for experienced photograpers. The Canon S90/95 are the same type of camera in a smaller housing and are lacking the hotshoe for a external strobe and some of the dials the G11/12 have, but for the sensor and processor they are identically.
FIX FISHEYE builds a supersmall and cute aluminium housing for the S90/95, expensive but very sturdy and well made, giving you a very small, camera rig.
The Nikon P7000 is a similar type camera and it seems that the P7000 is going very strong as well
For some reason Ikelite has chosen to place the flash diffusor against the uw housing; this means that you have the ligth source far from the end of the port so when you shoot macro's the port will cast a shadow over a large part of the subject. With this in mind I understand that this is not found useful. I am not fully aware of how the Patima system is with regards to the flash diffusor but trust this is also close to the uw housing. The Canon solution is to place the diffusor at the end of the port so the light is spread from there and the shadow subsequently much smaller.
However the Ikelite housing (I have one for my Canon S90) has a groove in the middle of the port and having seen that I simply increased the diameter of the scalloped part of the diffusor so it is possible to place the diffusor in the groove. Here it is much closer to the port end, the shadow much smaller and this housing subsequently fairly useful for macro.
The Patima housing uses a strobe bulkhead where the optical cable will firmly sit. This disable the use of the internal strobe but give you a perfect solution using a external optical triggered slave strobe. I am using a INON D2000 strobe on my G11/Patima housing and i am very satisfied with the results.
The Ikelite G11/12 housing has a electrical bulkhead giving you full TTL using a Ikelite strobe and a dial for fine tune the Ikelite strobe output, while the S90/95 is lacking this "important" feature because of the lack of a hotshoe on the S90/95.
The G11/12 camera is such a advanced camera that's a pity (backscatter, low power, shadows) to use the internal strobe as any housing (i know) for 28/24mm WA zoom lens will cast shadows due the necessary size of the port to allow zooming from wide angle to tele.
Chris