Tyrande had obsiously the upper hand and Sylvanas was only in the defensive stance. One can even say that an Elune empowered Tyrande is stronger than an Sylvanas empowered with Domination Magic.
However, it doesn't matter. Tyrande lost once again and Sylvanas literally got what she exactly wanted. Her plan worked perfectly.
I'm sure this was the last time Tyrande and Sylvanas interacted with each other, so who ever hopes for a rematch where Tyrande finishes her job, will be disappointed