Verdict
H2D is Bambu's 2025 dual-extruder flagship — true 2-color without AMS purge waste, larger 350×320×325mm volume, bigger price tag. X1C is the established CoreXY reference point.
Buy the H2D if: multi-color is a daily use case (eliminating AMS purge towers saves 30-50% material on 2-color jobs), large parts (300mm+) are common, you bill enough to amortize the premium in under 12 months.
Buy the X1C if: mostly single-color or occasional 4-color, smaller parts dominate, X1C ecosystem is already familiar, budget is the deciding factor.