The right choice....
is a very personal one and both of the watches have their atributes and are very different in design execution.
I would offer a different perspective that may assist in your evaluation and that is to determine what you want to focus on.
The Hublot focuses on the exterior for its differentiators from the pack. The use of non traditional materials (Ceramics, plastic, Carbon , etc) along with precious metals to make its statement and the IWC focuses it's effort on the interior of the watch case to make its statement.
With the IWC you arguably have one of the most elite perpetual movements made. One that offers the user countless hours of peering through the caseback to observe the beautiful in house movement within and an exceptional value for a perpetual watch.
For me the choice would be easy as the RG Perpetual is my grail watch and I wouldn't hesitate to acquire one if the funding were available. Good Luck and I hope that you show your pictures soon