I also hope they record the revival. I mean that cast is too out-of-the-world brilliant to go unrecorded.
Go with the OBC. I've been listening to it a lot lately and it truly is up there with one of the best cast recordings I've listened to. Pretty much every song works, I don't think there's a single throwaway somg. Even something small like "I Resolve" is perfectly delivered by Barbara Baxley. Barbara Cook gives one of the most gorgeously rendered performances I've listened to. The way she sings each number with such sweetness, naivette, intelligence and proficiency sometimes brings tears to my eyes (how corny, I know), but it really is the definition of sublime. Her performance of "Ice Cream" is a tour de force. And yes, "Tango Tragique" is reason enough to go with this one.
Ruthie Henshall is very good in the London recording, and she won an Olivier for her performance. It's a good recording but it doesn't have the magic of the OBCR.
"Some people can thrive and bloom living life in a living room, that's perfect for some people of one hundred and five. But I at least gotta try, when I think of all the sights that I gotta see, all the places I gotta play, all the things that I gotta be at"