Double strollers come in two different designs: side-by-side or tandem. Given the number of questions on this topic on various parenting forums, parents seem to be confused about which to pick, and understandably so: there is no single answer. Both designs have their pros and cons so it all depends on your specific needs and priorities.
Let's examine the advantages and limitations of both side-by-side and tandem style strollers:
The seats in tandem strollers are by definition one in front of the other, which allows for a much narrower frame. The obvious advantage of the tandem design is that it is easy to get through doors, hallways, isles, sidewalks and other narrow passages.
From a child socialization point of view, your children will tend to interact less with each other in a tandem stroller because they typically won't see each other and won't be within reach of each other. This may be a good or a bad thing depending on what you're looking for! Interacting less might mean longer naps and less fighting but it also means that they won't be able to play or communicate with one another as much. The amount of interaction you'll want may also depend on their respective ages: Twins might be better off side-by-side whereas siblings of different ages may be happier in a tandem stroller allowing the infant to nap while the older one plays.
Note that a few tandem stroller models now allow turning the seats so that children face each other or both face back to see mommy (for infants). This is a great feature that makes such tandem strollers a very attractive choice.
A side-by-side design is harder to get through narrow doors but is typically easier to maneuver. Not only side-by-side strollers tend to be lighter but the width between the handles makes it easy to turn on a dime. In contrast attempting to make a u-turn with a tandem stroller in a crowded supermarket aisle can be a real challenge given the length of the stroller and its weight distribution. And it's even worse when the older heavier kid is in the front, which of course they will want to be!
For errands where you have to get in and out of a car, note that side-by-side strollers tend to be smaller once folded and since they're also typically lighter, it's easier to fit them into the trunk of a car.
So before spending $500 on the coolest looking double stroller out there, make sure to factor in how maneuverable and compact you need it to be as well as whether you want your kids to interact or leave each other alone!
Related : Double Baby Stroller
