Power9 is the best.
Overall Satisfaction with IBM POWER9 Servers
We are using Power9 for AIX as well as Linux on Power.
Pros
- Micro partitioning
- Performance
- No downtime for Firmware Upgrades
- Small footprint
Cons
- Migration from Power6
- Positive impact, getting better performance
IBM Power9 Servers are better in performance and resilience.

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