Bear in mind that not all players that purportedly play both SACD and RBCD do a "proper" job with SACD. Many will convert the SACD datastream into PCM, and then process it through a standard 44.1kHz DAC. You will lose the advantage of SACD and maybe even get sound which is worse than RBCD. To play SACD properly, check if your player has a DSD DAC.
EXPLAIN HD SACDs to me.
I have a player that plays both. Explain these to me. Are they worthwhile