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All depends what better for you is. P11 is cheaper, easier to find and more documented. P12 is more recent would be best though because of improved cooling flow around the head; they come with the p12 cas that many use (400$) and single solenoid to switch the vvl that one can use and clears the firewall. The cams are decent too improving duration compared to p11 but the head costs double the money so is it really worth it?? Rhd japan sells brand New p12 cores for like 1200 I say that aint too bad cause many end up changing cams,valves and springs anyways. The killing point is rocker arms costing about 200$ new a pop (x8) if one cant find a used set; good luck with that!
For what this changes availability/money wise p11 end up being much more used than p12
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