I'm guessing you mean if you should use the GCH entrance or the front.
It doesn't matter - we were there Monday - the GCH line was super long, back past WWS. So we decided to go to the front.
There was a small problem getting our passes scanned which took a couple of extra minutes...
We went in and were going to toy story - we saw some people pass us that were getting into line at GCH as we were leaving.
Now, this was about 20 min after EE started. So to have a greater chance at being in the front of line, you should go to the front since more choices.. and I guess the front would have been closer if we were going to carsland.
but overall, not much difference, so if you picked "wrong" don;t worry!