funny as it sounds, i'd say the mk5 and mk25 are closer to each other than the mk10 as the piston heads are nearly the same. why they downsized the mk10 is beyond me... (its still a very good regulator).
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The reason I wanted to know is if my PX2 is serviceable I can get by just replacing my second stage snd octo. and use my first stage. My hoses and console gauges are all good.
Better performance based on better design and a much better value..
I would be willing to bet that you could not tell the difference in the way they both breath if your eyes were closed, and I would include any manufacturers top line regs.
We have already determined that any reg out there can outflow the tank valve it is attached to, so airflow is a non issue.
We have come to a point where "better performance" is more about splitting hairs than what any diver can detect.