Choosing a Docker container image registry requires considering multiple factors: Docker Hub (official registry, rich image library, but has pull rate limits), GitHub Container Registry (integrated with GitHub, suitable for open source projects), GitLab Container Registry (integrated with GitLab CI/CD), Harbor (enterprise-grade private registry, supports vulnerability scanning, image signing), AWS ECR (AWS cloud service, integrated with AWS), Google GCR (Google Cloud integration), Azure ACR (Azure integration). Selection recommendations: Docker Hub for personal learning, Harbor for enterprise internal use, corresponding cloud vendor registries for cloud-native applications. Pay attention to image size, pull speed, security scanning, access control and other features.