Both strollers are better for different things, and you will need to consider your lifestyle in this decision. While tandem strollers take up less sidewalk space and fold smaller in your trunk, side-by-side strollers allow both children to sit together, they are often heavier, and harder to fold. However, they're best for taking on buses. Stroller threads on parenting chatboards reveal mums worrying about having their child in the bottom seat at first. However, after using one, they realised that they often have great naps in that seat, as they don't get distracted. Side by side strollers are often recommended as they are more recommeneded for parents who like to jog. The downside of teh side by side is often quoted as is harder to maneuver when shopping and out and about, and having to wake up their children from naps when going home-if it doesn't fit through their own doorway.