I don't know about which one doing more damage, but you'll have to use more energy to heal if you don't do 20 stam attacks.
If do single hits, you actually do more damage to the party, you can do two 30 stamina and be covered by one heal for a time just throw in an extra heal a couple times to keep up.
Very good, to make sure not kill party accidentally, especially when it first posts, and everyone hits at same time, give them a little time to cool down and comeback, I do 3 of my own everytime, invite trusted raiders and have no problems.