Comparison between VoIP and ISDN

Say, do you have a graphic showing the relative quality of the user experience for telephone calls carried over ISDN on copper and those over VoIP calls ? I believe that calls carried over ISDN are of a higher quality in terms of User experience than those over VoIP.
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ISDN is a digital connection, VOIP Is an IP based mode of transferring voice data.
Just to be clear.

Quality of the call would likely depend on your Environment for the VOIP provider/call handling/router setup/bandwidth available and QoS policy.
If memory serves, and ISDN can only handle one call at a time.

Could you clarify what you are after.

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