That being said, here are some points to consider:
Brand image: Both Harley Davidson and Triumph have distinct brand images. Harley Davidson is often associated with American heritage, freedom, and a rugged, rebellious spirit. Triumph, on the other hand, is known for its British heritage, classic style, and performance-oriented motorcycles. The choice of motorcycle can help reinforce the character's persona and align with the movie's intended atmosphere.
Character portrayal: Pam Anderson's character in the movie Barb Wire is a tough and independent bounty hunter. The choice of motorcycle can contribute to the character's overall image and personality. A Harley Davidson could emphasize the rebellious and badass nature of the character, while a Triumph might accentuate a classic and refined style.
Visual appeal: The aesthetics of the motorcycle and how it complements the character and the movie's visual design are important factors. The choice between a Harley Davidson and a Triumph would depend on how well each brand's style aligns with the overall look and feel of the movie. The motorcycle should enhance the on-screen presence and charisma of the character.
Audience expectations: Consideration should be given to the audience's expectations and the image associated with each brand. If the target audience has a strong affinity for a particular brand or has certain preconceived notions about the character, the choice of motorcycle can either align with or challenge those expectations.
Ultimately, whether Pam Anderson riding a Harley Davidson or a Triumph would have improved or ruined the movie Barb Wire is a subjective question. It would largely depend on how well the chosen motorcycle integrates with the character, the story, and the movie's overall style. Factors such as the script, direction, and execution of the film would also play significant roles in determining the movie's success and reception.