A better shelving system
A Better Bracket
One of the reasons people prefer Click brackets is that they look better. Clean, simple lines with no visible slots make this a very unobtrusive system.
But the big practical benefit is the ease of installation. Whereas aligning the slots in slotted uprights. When fixing them to the wall, can be surprisingly difficult, Click brackets are infinitely adjustable, so horizontal alignment is not an issue - all that matters is getting the uprights vertical.
When you have decided your shelf positions, measure out the spacings; make pencil marks on the uprights; click in the brackets - and it's done.
The Click Upright is easier to clean and is currently specified for installation in hospital and clinic environments. Both the bracket and the upright can be sterilized as they do not rust. The channel can be fitted with a plastic cover strip, which can also cover loudspeaker wires etc.