Who should I dance partner in these situations??

Hi. I like using dancer but have encountered couple situations where I’m not sure who to dance partner with and would like some advice.

In normal parties I will partner with the other dps, and in a 8 man party usually a melee job.

1) in a 4 man party with 2 dancers, should we always partner each other or is is beneficial if we each partner the healer and tank?

2)in a 8 man raid with 3 dancers,one being me, who should we all partner up with?

Edit: thank you everyone!! I believe I now have a better understanding of the whole dance partner system and will keep in mind all these advices next time I choose a partner☺️