1. Data Sampling: LightStep uses dynamic data sampling to collect detailed data on a subset of traces, allowing for comprehensive analysis without overwhelming the system. In contrast, Monitis collects data at fixed intervals, potentially missing key information during peak load times or when anomalies occur.

2. Service Dependencies: LightStep provides detailed visualizations of service dependencies, making it easier to identify bottlenecks and performance issues across distributed systems. On the other hand, Monitis lacks this level of visualization, which can lead to difficulties in pinpointing the root cause of problems within complex architectures.

3. Real-time Monitoring: LightStep offers real-time monitoring capabilities, providing instant insights into the performance of services and applications. In comparison, Monitis has a delay in reporting metrics, which may lead to delayed detection and mitigation of issues affecting system performance.

4. Tracing Capabilities: LightStep's distributed tracing capabilities allow for end-to-end visibility into transactions, making it easier to identify latency issues and optimize performance. Monitis, while offering monitoring solutions, may not provide the same level of granular tracing features.

5. Alerting Mechanisms: LightStep offers advanced alerting mechanisms, allowing users to set up customized alerts based on specific performance thresholds and metrics. In contrast, Monitis may have more limited options for configuring alerts, potentially leading to missed critical events that require attention.

6. Scalability: LightStep is designed to handle large-scale distributed systems, offering scalability features that can accommodate growing workloads and data volumes. Monitis may have limitations in scalability, impacting its effectiveness in monitoring and managing performance in highly dynamic environments.

In Summary, LightStep and Monitis have key differences in data sampling methods, service dependency visualization, real-time monitoring capabilities, tracing features, alerting mechanisms, and scalability, with LightStep offering more advanced capabilities in these areas for comprehensive performance monitoring of distributed systems.