HDCD vs the Newer SHM-CD, BluSpec, UHQCD, etc

Has anyone directly compared the early 1990s 20 bit HDCD format to todays 16 bit SHM, BluSpec, UHQCD, etc, improvements of Redbook?

I’ve been very happy with the audio quality improvements I’ve heard on the recent generations of CD improvements, via improved surface materials, internal materials and cutting/forming of the reflective mirrors which the laser reads. I’ve tried them all (I think? lol), but have been particularly disappointed with HDCD, an early ’90s format. Theoretically HDCD should be better, despite lacking the improved materials and manufacturing techniques of today’s SHM and similar CDs. Then I realized my Oppo 205 doesn’t decode HDCD, and I’ve only been listening to the standard Redbook 16 bit signal of the HDCDs I’ve bought (5 over the past few years).

Looking around I’ve noticed that there is a vast array of music titles available on the used HDCD market. So I’m wondering if I should get a second disc spinner from the used market just for HDCD’s, with the intent of dipping into the array of music in that format.

I’d greatly appreciate anyone’s thoughts, who has compared these source materials, before I just go out and spring for an HDCD player to find out if it’s worth it to buy more HDCD discs, rather than just stick with the improved 16 Bit formulas available today. With that, yes, I also have a decent library of DVD-A, SACD & Hybrid SACD... but that field is limited, and generally pricy. Thanks!