Hello
The only difference between the 2 is one is digital and other is analog, I have not myself noticed any difference in the quality of calls between the old twisted pair and the hub, by the end of 2025 all suppliers will have moved over to a similar system often called 21CV, in fact currently Vrginmedia are no longer do new installs with twisted pair unless you are in a rural area with little or no mobile coverage.
Logically a digital system would be better than an analog system.
Regards Mike
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