Exadata X11 is the new king. You can find more details in this post

So time to compare Exadata X11 with some other vendor products.

Please do not forget.Database performance is closely tied to application behavior, and actual results may vary depending on your environment.

Here are some of the details:

Exadata X11M vs. IBM Power Systems

Oracle Exadata X11M:

Engineered specifically for Oracle Database, ensuring optimal performance and integration.
Utilizes AMD EPYC processors and Exadata RDMA Memory (XRMEM) to achieve ultra-low latency and high throughput.
Offers up to 25.2 million 8KB read IOPS per rack, significantly outperforming traditional system.

IBM Power Systems:

Designed for a broad range of workloads, including Oracle Database, but not exclusively optimized for it.
While powerful, may not match the specialized performance enhancements of Exadata for Oracle workloads.

Exadata X11M vs. HPE Superdome Flex

Oracle Exadata X11M:

Provides a fully integrated system with co-engineered hardware and software tailored for Oracle Database.
Delivers up to 500 GB/s analytics throughput, facilitating real-time data processing.

HPE Superdome Flex:

Offers high scalability and reliability for mission-critical applications.
Lacks the deep integration with Oracle Database that Exadata provides, potentially leading to less optimized
performance for Oracle workloads.

Oracle Exadata X11M:

Achieves up to 25.2 million 8KB read IOPS and 8.5 TB/s of I/O bandwidth per rack.
Specifically optimized for Oracle Database, ensuring efficient workload handling.

Dell EMC PowerMax:

Delivers up to 7.5 million IOPS and 175 GB/s throughput per rack.
While powerful, it is a general-purpose storage solution and may not offer the same level of optimization for Oracle
Database as Exadata