I think you could go either way since the dune probably goes well with the Winderemere, but I'm leaning toward the salesperson's recommendation, especially if your cabinets are more white than off-white. Plus, since it's a farm sink you're going to see a contrast more between cabinet and sink than countertop & sink.
Check the link below for more visuals.

Here is a link that might be useful: [cambris & sinks[(https://www.houzz.com/photos/quartz-cambria-windermere-phbr0lbl-bl~l_59097)

Hi Annz:

Cool, I will then cancel my dune apron sink and change to white. My kitchen is getting into shape now. I will definitely post photos!

Thanks!

Hi Annz:

An update: Ferguson did not allow me to change my order from a dune to white apron sink, even though it was just a day. Abyways, I am still happy with how it turned out and waiting on the countertops to be installed. I will post pics once the kitchen is done.

Thanks for your help!