1. Deployment and Cost: Fluentd is an open-source platform that is free to use and deploy on various systems, allowing for cost-effectiveness. On the other hand, Splunk Enterprise is a commercial tool that requires licensing fees, making it more costly for organizations.

2. Ease of Use and Learning Curve: Fluentd is considered to have a relatively steeper learning curve due to its high configurability and flexibility. In contrast, Splunk Enterprise provides a more user-friendly interface and requires less technical expertise to operate effectively.

3. Scalability and Performance: Fluentd is known for its scalability and can efficiently handle a high volume of data streams and logs. Splunk Enterprise, while scalable, may face performance issues when dealing with extensive data sets, especially in complex data analysis scenarios.

4. Community Support and Integration: Fluentd has a strong community backing, offering a wide range of plugins and integrations with various data sources and systems. Splunk Enterprise also provides integration options, but its community support may not be as robust as Fluentd's.

5. Real-Time Data Processing: Fluentd excels in real-time data processing, offering fast and efficient log collection, parsing, and forwarding capabilities. Splunk Enterprise is capable of real-time data analysis as well, but Fluentd may be more optimized for immediate data processing tasks.

6. Security and Compliance Features: Splunk Enterprise offers advanced security features and compliance support, making it a preferred choice for organizations with strict security requirements and regulatory compliance needs. Fluentd may lack some of the advanced security functionalities provided by Splunk Enterprise.

In Summary, Fluentd and Splunk Enterprise offer distinct advantages and limitations in terms of deployment cost, ease of use, scalability, community support, real-time data processing, and security features.