Great question, and a common design problem.
There is no "right" answer here, but here's a contemporary approach:
This looks like a commercial website. So, reducing cognitive friction for potential buyers is important.
You likely have a large number of users who are new to the site, so providing consistent affordance in your controls (especially in a nav bar where they are sitting next to each other) is important. Otherwise you may frustrate or confuse users.
Therefore, having a nav bar where some buttons are clickable and some are not (because they are dropdowns) is not a good idea.
As a result, every button on the top-level nav bar should be clickable. So for the
- Hovering over the button reveals the drop down menu, allowing users to navigate to a specific product.
- Clicking on
Products takes you to a products page which introduces all of your products and allows the user to select a product to explore.
Don't underestimate the importance of #2. It may take extra time to build a product page, but for new users this is an opportunity to provide branding, marketing, and information around your entire product line (e.g. "at Acme Company, all our products are hand-made and hand-finished using the finest leathers").
Again, there is no "right" answer here, so this is just one example of a modern approach.