If you're into collecting MiniDisc stuff (or, like me, just never got the message that we were supposed to stop using it), the "MDLP" badge on recorders and players is what you want to look for for the best quality equipment.
Even if you never use LP mode, the MDLP-badged equipment come with improved versions of the SP codec, as well.
("Hi-MD" is the ultimate evolution, but not worth trying to use now, since while they still make blank MDs, they stopped making blank Hi-MDs years ago, and they now command absurdly high prices.)