I thought that Shimano made a XT 11-32 cassette? Anyway I would go with Shimano. After spending some time on the internet there appears to be some (meaning not wide spread) issues with Sram feed ramps bending in the newer cassettes, prior to their newer version the ramps would simply break! So while Sram has fixed the breaking issue they are still bending which is unacceptable for long term happiness regardless of not being wide spread, I have no idea why some of them are breaking or bending, of course anyone complaining of such problems probably don't why either. I couldn't find any issues with the Shimano cassettes.