I can't imagine a situation where a person could use more weight on dips than bench. dips are inherently unstable, relying on two small contact points balanced on long levers with the shoulder joint operating from a weak position
compared to bench, one large contact point moving a contained mass with two levers.
that said..it's a f'ing excercise, either it works for your goals or not. bench is a standby for a reason, it's easy to learn, easy to increase load, builds mass like a mother and is functional for a lot of activities.