TPO and PVC are different membrane categories. A useful comparison considers the building's use, existing substrate, attachment, details, and product requirements. A broad claim that one material is always superior ignores those conditions.
What to do next
Ask for the exact proposed membrane and complete assembly. Compare repair provisions, maintenance guidance, and exclusions. Where rooftop activities create unusual exposure, obtain product-specific suitability information before selecting the material.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.