https://forum.audiogon.com/discussions/better-cd-sound-the-search
No matter what, the drawer has to open/close; CD has to spin and be read: belts get worn; internal moving parts get dirty or lube gets sticky and lasers get old/weak or out of alignment and no longer read the discs.
I checked date of manufacture and availability of replacement parts when considering.
I want a combination of single and changer. Space considerations, and no desire to stream, I am staying with a units with internal DAC(s). Cost considerations I am going used.
I researched, determined I wanted dual DACs and decided to try one with Burr Brown DACs; another with Wolfson DACs.
Denon 2910 arrived played erratically for 2 days, then Laser couldn't find the discs at all. New laser arrives Monday, fingers crossed. It plays SACD and CD.
Integra CDC-3.4 changer does not play SACD, I found one made in 2019, it arrives this coming Friday. Belts and Lasers are currently available.
Many units are missing remotes, I limit choices to units with remotes, and it if breaks, replacement remotes available.
Even then: sometimes an unidentified change is made, and a different remote used. Integra used one remote until they issued Mark 2 with a different remote. suffix letter M after the serial # means mark 2, otherwise there is no way of knowing mark 2 exists. It took me many emails to get that answer.