loop trough unit group

i wonder which method is fastest (performance) to loop trough a unit group.
Is it to use the ForGroup() native or is it to use FirstInGroup method.
Anyone got any idea?

ForGroup is faster if you must keep the unitgroup

FirstOfGroup is faster if you don't care about destroying the unitgroup

Really? I always thought ForGroup was faster no matter what.

1. Create a blank map
2. Write a function to test one loop
3. Write a function to run (2) 100-300 times with TriggerEvaluate
4. Write another function to run (3) 100-300 times with TriggerEvaluate
5. Write a trigger to run (4) at TriggerSleepAction(0.) after map start
6. Start warcraft, move mouse, count seconds on windows or wall clock until warcraft unfreezes
7. Go back to 2-6 but switch to the other loop, then compare the times and tell us what you find.

hm its ok, i have choosen to use forgroup, since i wanted to avoid loop :P