Would a person with an amiable social style be better at selling than a person with a driver or an expressive style? Why?

Yes

Explanation:

A person with social style, understand the society and how to relate with people, this type of person can easily understand what the other person understands ,the pain point and what drives there needs, such person will be good at selling because the necessary skill to attract people is there 100% compared to a person with driver or expressive, here the express type only understand expression but he needs that social skill to get people to expresses too, so he can't be better at selling as the social interaction skill is absent .