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I see where you're coming from and some people do just bot for the fun of it but others including me multibot purely because of the much higher xp gains provided by the meta.
The best party composition will always be personal preference and what your expecting to get out of using Demonbuddy.
Personally, I usually end up with a meta group at the end of the season due to the higher greater rifts that can be achieved.
If I am farming for gear for a particular character within that meta group I usually use four of the same class to increase my odds of getting closer to perfect items.