In my humble opinion it will depend on the age of the components involved.
In a CD player, the lens reading mechanism and the dac are synced to the same clock.
But when we use the same CD player as a transport to an external dac, that time sync is lost. However, if the external dac is really superior to the inbuilt dac of the CD player, then it might sound better.
Not to mention adding external clocks to sync the CD transport to the external Dac.
So considering so many variables involved, including the quality of the interconnects, I think it will be difficult for me to absolutely take one side sir 😁.
Probably auditoning is the only way to find out 😜