The chief difference between a broad differentiation strategy and a focused differentiation strategy is

the number of value drivers that a company is using to achieve differentiation.

the number of attributes incorporated into the product offering$--$a broad differentiation strategy involves a greater number of attributes and features so as to broaden the appeal of the company's product offering to more buyer groups and thereby secure a bigger volume of sales.

the size of the buyer group $($or number of market segments$)$ that a company is trying to appeal to$.$

the size of the geographic target market that a company serves$--$the geographic target of a broad differentiation strategy is usually national or global whereas a focused differentiation strategy is aimed at serving buyers in only a local or regional market area.

the breadth of the company's product line$--$a broad differentiation strategy involves offering buyers a fairly wide selection $($to attract a broad range of buyers$)$ whereas a focused differentiation strategy entails a very limited selection.