I have learned from my experience with Scotch Doubles is that it works best for one player to be the leader and the other more of a shot maker, with situation exceptions.
The leader makes the pattern decisions, and partner executes the shots. If there are shots that are more difficult, plans can be changed.
With evenly matched players, they just need to get along and be flexible. ie. if neither wants to be the second, even for a little bit, there will be trouble.
In one tournament, I played position for the "2", relayed my plan to partner, she shoots another ball. I jumped over a ball to make the 2 and we continued to run out. Would have been tough her way.
My best results have been playing with a lesser player, or a better player who I defer to.