If you are hosting an event. Would you like to scan tickets on the door from your app, and then it handles everything in the background? Or you prefer paper tickets with a printout of your spreadsheet?
I certainly prefer scanning tickets-- it's more secure and faster, but I always like to have a paper backup. Scannable tickets was a core feature for Qwitix, but over half of our event organizers just print out the guestlist and check names off as they come in.