Two-Wheel Vs. Four-Wheel Folding Shopping Carts: What’s The Difference? This article compares two-wheel and four-wheel folding shopping carts, focusing on design, mobility, stability, usability, and suitabilities for different terrains and user needs. Two-wheel carts excel on stairways and rough terrains but require tilting, while four-wheel carts offer ease of use and stability on flat surfaces but are bulkier. The choice depends on personal preferences, usage scenarios, and physical capabilities.