Depends on your material. On well-recorded and mastered material, new CDPs have the advantage. On many older recordings, I prefer older CDPs because they produce less detailed sound and mask some flaws of these recordings. I'll take a new CDP with a Wolfson DAC for, say, Porcupine Tree, Bat for Lashes, last Nick Cave album but an old one with a TDA1541 or AD1864N for Led Zep, Hendrix, early Pink Floyd albums, pretty much the whole 80s hard rock/metal scene, early Nick Cave... I actually have two CDPs for different types of discs in each system.
There's a reason audiophiles tend to listen to audiophile recordings - hi(er) end gear often exposes the recording/mastering flaws so much it makes the listening experience unpleasant.
History of use does not affect the sound of CDPs as much as much as it affects their mechanics, at least that's been my experience. But capacitors do dry, same as in amps. and as far as mechanics go, in modern CDs transports tend to die after 1-2 years of use. Actually, if it is an option, when I need a laser replacement I prefer to buy an old CD and harvest organs then buy a new part, the one made 10-20 years ago is more likely to last longer. So, basically, as far as reliability is concerned, no advantage of one over the other, both old and new can die on you soon enough.
With SACD, don't forget Japanese SHM-SACD editions of rock classics (for Black Sabbath 'Paranoid' it's actually the only good sounding digital release), same from MFSL, Audio Fidelity. So, yep, thy still make those and people buy them.