Simplified campaign structure: products or countries?

Hey everyone,

I normally keep a very simple stucture in my account: a campaign by country and 2-3 as sets by product/offering. But recently a client came to me and they have more countries than products/offerings. What structure would you chose then:

County(campaign) - product1-product2-product3 Or Product(campaign) - country1-country2-country3 ?

With so many recent horrible changes in Facebook algorithm I kinda scared to try things and to ruin it even worse.