CPU usage is not a reason to use one method or the other, these are chosen based on the network topology design and needs for the site. With all the processing that happens on the PA firewall routing is among the least stressful for the system. Those that are intensive have custom silicon to assist in the processing tasks.
Personally, I like to solve routing problems with virtual routers first. This just keeps systems simpler and allows routing distribution and virtual router separation to work as intended and designed.
For me PBR kicks in when you have edge cases that cannot be easily solved with virtual routers and route distribution.
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