Blu-Spec vs. SACD, ?

They are both very good but a good blue ray player is less money than a good SACD player and it can also play movies. I have a Sony Universal player that can play both. I think the preference between the two depends on the mix rather than the format. 

Kota 1, thanks. 

Blu-Spec is NOT a format. It's standard redbook compact disc on a disc of supposed better quality and data writing with more manufacturing precision. It plays on any player that plays compact discs.

SACD is a high resolution format that requires a player that can play SACD discs.

If one started with an analog recording or a high resolution digital recording, the SACD would probably sound better* because it's a higher resolution format.

The previous post conflates blu ray disc (the video format the also had audio-only releases) with blu-spec cd.

* - some people will suggest redbook cd and SACD will sound equally good and/or standard redbook cd is sufficient to capture all the data in a recording.

As above. I have a few Blu Spec CDs from Japan. They sound great but it could be the remastering.

Regarding SACD, if you have a player that can play the DSD layer of the disc, it will sound better than redbook CD