I recently reached the mission where you have to choose whether to cleanse a colony and side with the protoss, or try to save that colony and fight the protoss.
I chose to save the colony, that gave me +3 zerg research, and a nice cut-scene of the doctor leaving the ship and asking me to settle down with her.
What is the difference on that mission if one chooses to side with the protoss? Does this choice affect the story somehow? How does the doctor react?