Original manufacturer’s canvasses will be a like-for-like canvas or may be a newer version if the manufacturer has updated their design for any reason.
There aren’t usually any options available for customising an OEM canvas.
A bespoke canvas can be made for just about any pop top roof and can offer opportunities to customise the look of the van by adding details maybe not available with an OEM canvas.
Options can include choosing a colour from the wide selection of available colours, adding a scenic front opening zip, adding details like contrasting coloured window flyscreens, adding extra elastic pull-in straps to help prevent canvas damage.