Take it to your Battlegroup forums.
In reply to the actual question, there is no quick answer, as there are far too many variables involved including group makeup and battlegroup trends. Suffice it to say, if one member of your group is attacked first more than 50% of the time, your team may benefit more from that member utilizing mixed stam/resil as opposed to all stam gems.
For a more involved discussion, the search tab is your friend....
The True Impact of Resilience