There are lots of situations where the Power chips are far better than the x86 chips.
The question is if this added capabilities are worth the money.
If you have an application that is easy to split across multiple systems, the answer is probably no, but for applications that are harder to scale, the dramatic improvement in per-thread performance on a Power chip can be worth a LOT.
x86 didn't win because it was better than it's competition, it won because it was more common. It was more common because it was 'good enough' and cheaper than the competition, and it is what happened to be picked for the PC that got cloned.
In many ways x86 is a far worse architecture than just about anything out there. But AMD and Intel have put HUGE amounts of effort into speeding it up. But even with all this effort, it's not the best performing chip available, and it's not the most power efficient chip available