side by side vs front and back

when I was pregnant with Lena, I spent a lot of time researching double strollers. With two under two I thought it was pretty much a necessity (and I was right). In fact, I actually have two doubles, one for the mall and the zoo and other such places, and one for walks around the neighborhood. But unfortunately, both my doubles are side by side doubles. I made that choice after thinking long and hard about the pros and cons of both side by sides and front and backs. I chose the side by side because they tend to fold down smaller and be easier to steer and I didn't want one girl to always be stuck in back and unable to see.

But I didn't think about how easy it is for two little girls to fight constantly when strapped in side by side. Today we went for a walk with a friend. All four of our kids fell apart and were howling in their respective strollers at one point, and Tempe and Helena quickly lost it completely. It started with leaning on each other, then pushing each other, then scratching, hitting, and biting each other. I actually had to take Lena out and carry her the rest of the way because the fighting got so bad. So experienced moms, what do I do? Besides rue the day I chose a side by side double stroller, of course.