Both serve the same purpose but suit different situations. Online diagnosis works through questionnaires, video calls, and document sharing. Its advantages are flexible scheduling—no need to coordinate on-site visit schedules—and relatively lower costs, making it suitable for companies wanting quick situational understanding or with limited resources. On-site consultant coaching's strength is observing actual operations firsthand; some process problems aren't visible in documents but consultants catch immediately on-site. For enterprises with complex processes or requiring deep transformation, hands-on coaching is typically more solid. When deciding, consider: problem complexity, whether the company can dedicate people to organize information, and budget size. Some companies do online diagnosis first to quickly confirm direction, then bring in on-site consultants for deeper work on priority issues—the two aren't mutually exclusive.