Debate
In this 2 parties pick up opposites side of the topic.
The intent is to prove that you are right via disproving others.
Various techniques like change in voice modulation, making personal emotional attacks etc. are used.
The person who wins loses in reality & who loses wins
Discussion
In this 2 or more than 2 parties pick up all the sides of a topic.
The intent is to find what is right
Simply what is known or understood is used.
Everybody wins
So what do you wanna do?