There exist a huge difference between face to face and telephonic conversation. Face to face conversation is much better than telephonic conversation.
Firstly, it expresses the face expression. The expression is very much important because in a telephone call, we might say something with a different intention and the other take it with a different intention, it creates problem between the two. Whereas in face to face conversation everything is cleared whether it was a sarcasm or a serious talk or a taunt etc.
Secondly, having face to face conversation leaves with no misunderstanding, you are talking exactly with a person standing by your side but telephonic conversation can create many misunderstanding as well.
In a face to face conversation, there exist no sort of network issues and problems, but in the telephonic conversation you can have network issues due to which you sometimes cannot talk and express yourself.
Telephonic calls can be ignored and neglected while the face to face conversation are done in a clear manner.
Overall, face to face conversation is much better than telephonic conversation, which does not create any sort of problems.