Government filing charges do not depend on whether the claim is special knowledge or advanced knowledge. Preparation costs can differ because an industry comparison and an internal process comparison may require different research and records.
Scope the evidence work
Ask for an estimate tied to the available documents and the selected filing route. Separate official fees, applicable supplemental charges, any optional premium processing and professional work. Do not pay for a claim of exclusivity when the evidence supports a different lawful argument.
No fee or more elaborate expert description guarantees approval. The cost difference between the two arguments is mostly a function of what already exists in the company. An advanced-knowledge case often needs internal information the organization has never compiled, such as how many employees hold comparable expertise and how they reached it, and gathering that can involve human resources, technical managers and a review of training records.
A special-knowledge case often needs the organization's distinctive methods described in a form an outsider can follow, which may require technical writing time. Neither is inherently cheaper; ask the adviser which one the available material supports and what each would require. Confirm government charges against the actual petitioner and filing route including any applicable supplemental fee, and treat any suggestion that a particular argument is faster or cheaper as a claim to be tested against your own records.