The "Performance-optimized Compute Unit" suits low latency or high throughput similarity searches. This option works best for high-search performance scenarios.
The "Capacity-optimized Compute Unit" suits data volumes that are five times larger than the performance-optimized CU option but at the cost of higher search latency. This option works best for increased storage capacity scenarios.
The "Cost-optimized Compute Unit" provides the same large capacity as the "Capacity-optimized" option, but at a lower cost with reduced search performance. This option is ideal for budget-conscious projects that need ample storage without high-performance demands.
For more details, see Select the Right CU.