Vendor evaluation matrix

Evaluate [VENDORS] for [WORKLOAD]. Use current official pricing and documentation. Build a concise matrix covering capability fit, latency or performance evidence, reliability controls, security, data residency, observability, lock-in, migration effort, and realistic total cost at [USAGE]. Flag where evidence is missing or marketing-only. Recommend a default and a fallback, plus a small proof-of-concept that could falsify the recommendation.