A white strap gives this carbon RM 55 a quieter outline without making the skeleton front plain. It lets the case texture and dial depth do the work, which is useful for a buyer who wants the reference to remain distinctive without a bright wrist accent. The neutral setup also makes small fit errors easier to spot, so side and lug photographs are especially valuable.
Compare the blue and white pages using the same questions, not the same adjectives. Check the crystal edge, crown seating, case profile and strap transitions on the individual watch. This keeps the decision grounded in visible execution and the way the chosen configuration will actually be worn.
The white perimeter also gives the openworked front a more measured rhythm in photographs. Look at the dial first, then the case edge, and only then the strap connection. That order helps separate the reference's architecture from the styling choice and keeps the QC request useful.