Table Type: 3D tables are inherently structurally stronger. You’re no longer relying on just the thickness of the top since there is an engineered structure supporting it. The top doesn’t need to be nearly as thick.
Material Choice: A tougher material (like A572-50) can “spring back” from an impact better than a softer one (like A36), potentially allowing for a thinner-but-stronger surface.
Workpiece Requirements: If you’re welding small parts and tubing, a thinner surface is fine. If you’re building heavy items (like fire engine bumpers) and risk massive impacts, you need more mass to prevent damage.