DSL or cable better suited for calls?

There are two of us living in a shared apartment and I or we often use zoom or Skype or watch something on Netflix from time to time. It's not about downloading files, pictures, etc. Which is better?

Makes no difference.

In general, it depends on where you live. But you can check online how many Mbit / s are available at your own address:

https://zuhauseplus.vodafone.de/m/internet-telefon/kabel/

https://www.telekom.de/...ternet-dsl

100 Mbit / s should be enough