I recently booked return R class to North America for travel in June. Final destinations are MSP/YYC which gives multiple routing options - only R class availabilities over multiple dates were on 777 metal. Nothing for 787.
I’ve transited IAH multiple times but never been through ORD so the thought of a new airport and 787 was appealing, but by all accounts the IAH transit experience is probably superior, especially if I get 8hrs sleep prior.