Hello Songbird,
I am a parent coach and was a nanny for many years. I have either had charges from different families who were different ages apart or parents I coach who have talked about the challenges of different age spaces.
With children who are close together you have the advantage of nap times often are similar, they can sometimes play well together and they will often like the same type of toys.
Have children close together can be challenging too, because they both need so much attention, and they have a hard time understanding WHY Mom can't pay 100% attention to them. As they grow, they can feel a loss of idenity, because they are so close.
I worked with girls who were about a year a part, and they were always mistaken as twins. The oldest child always felt that she was not a single person but one of two. They often had the same friends, and it was hard to schedule seperate playdates etc. Both girls felt this was unfair.
Having children with an age gap, (3+ years), can also be difficult. One family talked how they have to leave the park for nap time, even though thier oldest doesn't nap anymore. Their oldest also cannot have lego's because of the small parts. Have an age gap often means the kids won't "be friends" as young children, because they won't have anything in common.
However, having an age gap is often easier on Mom, because they older child can emotionally handle another child as well as Mom focusing on the baby. Older children are also able to play alone longer, which is easier on Mom.
I hope these answers helped.
R. Magby