Battle of the Baby Jogger All-Terrain Strollers! Baby Jogger Summit X3 vs. Baby Jogger City Mini GT2 Double The GT2 is better for families who need some all-terrain capability, want never-flat tires, an adjustable handlebar, and a slightly more compact fold. The Summit X3 is better for families who want to jog or run with their stroller. It features a hand brake and offers a smoother ride with air-filled tires and a three-wheel design (though I do recommend keeping a bike pump on hand). Both of these strollers have great canopies, are car seat compatible, but do have fairly small basket. What would you like to know about these two strollers? LTKBump LTKmomlife LTKBaby