Short answer
Choose by project fit, local permit experience, communication style, fee clarity, consultant coordination, and whether their portfolio solves problems like yours.
Portfolio fit beats prestige
Awards are nice. Relevant work is better. A hillside custom-home architect may not be the right fit for a modest garage conversion.
Make the fee exclusions explicit
Survey, engineering, title 24, arborist reports, planning hearings, renderings, and construction administration may sit outside the base fee.
Look for process clarity
A good architect can explain discovery, schematic design, design development, permits, bidding, and construction support without fog machines.