These two watches are not cheap, with the IWC likely to be much more ($$$$$$). Regardless they are amazingly impressive, with my pick being the IWC Portuguese Tourbillon Mystère Squelette, although the Patek Philippe is an amazing depiction of what a traditional skeletonized watch should be. Overall, these watches are something that you wear to look at, being distracted by the generous level of detail, only to forget to check what time it is, and back again for another look.
Actually, a seller on eBay of a new Temption Cherubin GDA posted images of the Cherubin right next to a similarly hued Rolex Yachtmaster. It is fascinating to see the two watches together. The Cherubin is large, much more whimsical in its approach, while the Rolex is a bit smaller and far more conservative. You could easily see the same person having both watches in their collection, the watches seeming to satisfy completely different needs, but still being able to exist together.