Are leather or nylon tool belts better?

It depends on the trade and how you carry weight. Across specialist carpentry and electrician communities, leather (OX, CLC, Occidental) is praised for durability and breaking in over years, but reviewers consistently flag that it's heavier. Ballistic-nylon and modular systems (DEWALT, ToughBuilt) are lighter, cheaper and quicker to reconfigure, at the cost of long-term lifespan. Heavy framers tend to favor leather; electricians and handymen who swap loadouts often lean nylon or modular clip systems.