Look at the types of questions you ask. Both will get you to the dance, but the Mercedes sells itself. The Ford is a hard sell, especially if they're side by side. Consultants are considered experts. Sales reps are considered salespeople.
Sales reps sell, sell, sell.
Consultants are respected as leaders in their field. Sales reps strive for recognition. Consultants are confident. Sales reps fight to gain a positive image. Consultants are articulate.