Both are at their strongest.
Personally, Legolas would succumb to her Starfall ability, and her Searing arrows, the former dealing magic damage (1900-2100 in WoW damage) and the latter dealing fire damage. (600-800 in WoW damage)
Endu'di Rifa! ("Kill the defilers!" in Darnassian, the language of the Night Elves, Tyrande's race.)