Heat-sealed: Zero water absorption (they don’t get heavier), perfectly spherical shape, more stable and predictable flight through the air, as well as a softer touch, but with a high purchase cost.
Machine Sewn: Low cost, ideal for casual play. The seams are more superficial and exposed, and they absorb water easily.
Handmade: Durability over time and on hard surfaces, but the seams absorb more water, causing them to become heavier in the rain.
Hybrid: Excellent value for money, with very good water resistance and great durability, ideal for everyday training sessions in academies.