Well, both suggestions fit the context, but only the first one is a cross-sell.
In the second one, the cashier would be upselling by offering a more expensive brand. In contrast, in the first one, they are bundling products to complement the customer's purchase.
Remember that as a cashier, you are contributing to marketing when cross-selling or upselling.
Still, you have to make sure that you are not being pushy. Otherwise, customers might get upset and not be comfortable coming back again.
Check out this video about how to start a cross-selling conversation.
It is worth watching from 2:45 to 4:45.
Photo by Christiann Koepke on Unsplash
Reference: The Art of Retail Upselling: How to Get Your Customers to Buy More (+ Tools and Examples) by Alexis Damen on Shopify