Pros and Cons of two different Clock Generators in a CD Player

There are any few CD player models with only one master clock generator (responsible both for MCU for control unit/operating keyboard, PCM decoder and DAC).
Examples are Cambridge Audio's models from 1993-1996 (CD-4/Trac-1, CD-6, CD-T, DiscMagic), and TEAC's CD-P 1100 (all equipped with SONY's operating MCU CXP1011Q).

Most of cd player models uses an extra 6 MHz clock generator for the MCU for control unit keyboard and display driver who works independent.

What are the pros and cons of both approaches and what of them provide lowest jitter results ?

Thank you for clarifying and sending links to appropriate papers concerning this topic.
 
Not sure that the reason behind using only one clock for everything would be to control jitter. It could be that it simply allows the whole system to work with synchronous logic. That's one way to avoid having to deal with asynchronous logic timing issues.
 
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