Laughing at all of these. We have a 2 year gap and a 3 year gap. It's hard to say which is better. So much depends on the individual personalities of the kids and how they interact with each other. I will say that DS is lucky that he was conceived before his sister was out of diapers. It was hard to go back after even just a few diaper-free months.
Just remember that you can plan and try to pick the perfect gap but your body doesn't always cooperate. I had a hard time conceiving my first kid but conceived kids #2&3 very easily. I have other friends who had the opposite experience.