I know in my state my atty said you each have one strike in the appointment of a GAL. So they appoint, and each side can make a strike and the will appoint a different one. Talk to your atty and find out who are the good ones, and how to make sure the one you get is a good one.
Here, they vary. There are a few who are terrible, others who do a really good job.
Just my .02 to add friend.