VPLEX Metro. How does the management of iops work?

This is happening to a client that analyzes the consumption of iops between the storages of the two extremes of vplex, both are similar.

My explanation is that having Distributed File Systems is logical that the iops are similar, but the client states that according to his analysis the vplex allows access to both ends at the same time according to the best availability.

According to what I previously knew and what I was able to reveal up to now, this situation does not occur for the same consistency group, what I can do for the active / active configuration is for different consistency groups.

Is it right or am I wrong?

Thank you very much for sharing your knowledge.