1. Scalability: Celery is a distributed task queue that can handle a large number of tasks and workers. It provides a highly scalable architecture that allows for large-scale task execution and management. On the other hand, NSQ is a real-time distributed messaging platform that focuses on scalability and reliability. NSQ is designed to handle high throughput and message volume, making it a robust solution for demanding workloads.

2. Delivery Guarantees: Celery does not provide built-in support for delivery guarantees such as at-most-once, at-least-once, or exactly-once semantics. It relies on the message broker for managing task execution and delivery. In contrast, NSQ provides configurable delivery guarantees that allow users to choose the level of reliability they need for their messages. NSQ offers options for at-most-once and at-least-once delivery guarantees, giving users control over message reliability.

3. Architecture: Celery follows a task queue model where tasks are produced by clients and consumed by worker nodes. It uses a message broker to manage task distribution and worker coordination. NSQ, on the other hand, utilizes a distributed messaging system architecture where messages are published to a topic and consumed by subscribers. NSQ's architecture is designed for real-time message processing and delivery.

4. Ease of Use: Celery is a feature-rich framework with support for task scheduling, result tracking, and monitoring. It provides a high level of abstraction for managing distributed tasks and workers. NSQ, on the other hand, is focused on simplicity and performance. It offers a lightweight messaging solution with minimal configuration and overhead, making it easy to set up and use for various use cases.

5. Community Support: Celery has a large and active community of developers and users who contribute to its development and provide support through forums, documentation, and plugins. NSQ also has a growing community of users, but it may not have as comprehensive support resources as Celery. However, NSQ's simplicity and performance make it an attractive choice for users seeking a lightweight messaging solution.

6. Monitoring and Management: Celery provides built-in tools for monitoring task execution, tracking results, and managing worker nodes. It integrates with popular monitoring systems like Prometheus and Grafana for performance analysis. NSQ offers basic monitoring and management capabilities through its built-in statistics and admin interfaces. Users may need to integrate NSQ with additional tools for more advanced monitoring and management features.

In Summary, Celery and NSQ differ in scalability, delivery guarantees, architecture, ease of use, community support, and monitoring capabilities, catering to specific use cases and preferences for distributed task management and messaging systems.