Yes beauty is subjective. I love the perf's front end design and the forged carbon looks, but the wing shape could be better designed imo and everywhere else is not much different than a "normal" huracan. The STO is special, looks special from almost every angle. Can't say one car looks better than the other, both are beautiful cars, but I would prefer the STO as it was love at first sight. Buying the perf I was excited but not nearly as excited and in love as when I saw the STO. I wouldn't call the STO a "pretty" car, but it is quite a spectacular piece to stare at.
As for numbers, there's no hard limited number but from what I heard from multiple dealers, lambo is controlling the numbers in some sort, by roll out. Yes they will try to build as many cars as demand requires, but is that realistic? No, the number of people that want the STO and put their deposits down is insane, its just not possible for everyone who wants one to most likely get one. Dealers have to satisfy demand of VIP clients and existing clients placed at the top and going down. With lambo limiting roll out allocation numbers, the number of cars within the limited time frame won't be as much as people think. It's basically limited production by time not strictly by number, remember these manufacturers don't build that many cars a year in total anyways compared to other luxury brands, the percentage of cars ending up as STO would be very small even though they say they'll try to build as much as they can.