I am by no means an expert on Utah mountains, but I would say from my experience that that is accurate in a way. PC is absolutely huge, technically much bigger than brighton unless I'm somehow mistaken. So technically, PC has more overall skiable terrain. That being said, from what I saw when i went there, brighton has a lot more back/side countryish terrain. By that i mean cliffs, chutes, etc. PC has the Jupiter Bowl, which is definitely sick, but other than that, I didnt see much that compared to brighton.
That being said, you should take what i say with a grain of salt. I skied 5 days at brighton, 1 at park city and 1 at snowbird. So i got to know brighton a lot better than i got to know PC. And snowbird was without a doubt epic as far as the gnar goes. I have to say though, of the three, brighton was my favorite overall, even though snowbird trumps it as far as terrain goes. It may have been because i spent so much time there, and it kindof became my home away from home mountain, but i think it had more to do with the general vibe. More laid back, less crowded, and the terrain was still very sick.