I don't have any personal experience with this particular situation but I believe both windows are fairly close to each other at the front of the parks. I would think guest services would have a slight advantage just because if the guest services window outside the park has a long line you could go ahead and enter the park and go to the one inside? Hopefully someone who has done this can chime in....
Save Up to 30% on Rooms at Walt Disney World!
Save up to 30% on rooms at select Disney Resorts Collection hotels when you stay 5 consecutive nights or longer in late summer and early fall. Plus, enjoy other savings for shorter stays.This offer is valid for stays most nights from August 1 to October 11, 2025.
CLICK HERE