Web UX – Serving two versions of site based on selected customer type

I'm building a site for an accounting firm. They would like to serve two distinct home pages for "Individuals" and "Businesses."

The site would look similar but have different content relating to the services they offer these two types of customers.

• What is the best way to allow users to choose their customer type? (Currently thinking pop-up prompt on first visit)
• How easy should it be for users to switch between types?
• How obvious should I make it for the user to know which version of the site they are on?
• Any differences between desktop and mobile?

Thank you!