If it's PS4, not PS4S, and for daily driving only, probably 215. A bit lighter weight, slightly lower sidewall, a bit more stretch, - sharper subjective steering feel due less sidewall flex due more stretch. If occasionally tracking, on 17x8 .. hmm, probably 225. Still, not unreasonably wide, but a slight bit more lateral grip (though of course, most comes from tire compound) and maybe more resistant to overheating (imho PS4 was easier to overheat on track relative to PSS/PS4S).
BTW, imho speedometer reading doesn't matter much. Given that even with OE tire size speedo lies on modern cars 5-8% by manufacturer agreement, with slightly larger tires it will even lie less
. What imho matters more to driver when changing to larger tires, that on our relatively low power/torque stock NA power change to overall gearing may make hit to acceleration .. but then again in this specific case that hit is small, difference between 215/45/R17 & 225/45/R17 circumference/speed variance is
1.55%, not that drastic, within "safe change range". IIRC not the case with MPS4, but for some tire models 225/45/R17 was cheaper then 215, due 225 being more common sizing.