I generally prefer to check-in online since I don't know in advance whether or not the lobby will be busy. Having said that, it did backfire once in that I scurried through the lobby at GF and went out to the building where my room was only to find out that the Unlock Door feature was not working on neither the app nor my Magic Bands. Therefore, I then had to walk back to the lobby to wait and get keys provided to me (which did work). They acknowledged there was a recurring tech problem and I was not the only one with this problem. This happened about a year ago. I subsequently went another time, took my chances, and it worked successfully so hopefully it was a one-timer. But I would just mention it as an unanticipated downside I had by going straight to my room.