Telemetry makes more sense for crash analysis. 1) First off, you don’t have to try and find a CVR buried somewhere in the rubble, and then pray that it survived. 2) Secondly, pilots are not a primary source of good information because what people say is not always what they are thinking or doing. 3) Telemetry is already proven in the space program; it keeps providing data even after a crew is incapacitated.