We also have the single and double Peg Perego Aria. We had the larger peg perego single one at first too, don't remember the name, but once we bought the Aria, that was all we used. After DD2, we started shopping for the double stroller, originally looking at Maclaren, but then we saw the Aria double and loved it. It folds exactly the same way, the seat width does seem the same for the single and double. My DDs are 3.5 and 1. Sometimes there are issues, where the younger one will reach over to the older one, and mess with her, etc, but no more so than with other strollers. I really wanted a side by side for Disney, not wanted one to be in the back because I know my older daughter would have wanted to be in the front, then the younger would kick the chair, etc. This has worked out great. We haven't been to Disney yet, but are going this fall, and hopefully will do well with that stroller. Good luck!