Not only do you not have to stand in line to get it, but you'll actually know what's in it.
Chain store baristas just take what's in the bottle and put it in your cup -- trust me, I used to be one. Does it have preservatives, additives, completely copious amounts of sugar and corn syrup? Yeah, your barista doesn't likely know. If said barista is kind and the counter is slow that day, she might let you read the label on the bottle of Mystery Pumpking Spice Syrup, but that's about all she can do for you.