As based on your requirements of wanting a single piece to be wearable for dress aka formal/semi formal as well as sport aka rough and tumble events in life as we know it in the present day, both of the pieces for comparison on paper do seem to be about equal in terms of what they present themselves to be. I would think however that the best option would be Mille 005 TI based on the factors below...
I suggest 005 in ti is because IMHO it would show less wear and tear over the years as opposed to the shiny bracelet/case of the Jumbo. While the weight of the WG PP Jumbo on your wrist manifests itself well as luxury on dress/safe/controlled events, it might very quickly outlive its welcome when you are reaching over the luggage bin overhead, grappling with umbrella in the pouring rain etc. Its barely noticeable weight will be most appreciated during these and other moments when we dont want/need/have time to be careful.
Fashion/luxury/utility has been blurred with the every increasing passage and speed of such passage of time. What was once taboo for luxury is now starting to be mainstream/expected in luxury whereas what was once materials used solely for utility has now jumped over to being recognized as part of luxury.
I say go for the RM 005 in ti.