https://recruiting.ultipro.com/URB1003UROI/JobBoard/10af8568-5cfd-415b-8dc2-ed6cecf3006c/OpportunityDetail?opportunityId=62f3a51f-e7f3-43b5-a2f6-6236d677d2f8
A fixed price is best for jobs where the scope and timeframe are well-defined.
An hourly rate is best for ongoing work or jobs where the scope and timeframe are flexible.