No, I spelled Platinum correctly.
I haven’t played heartgold, but Platinum has the best battle resort area of all time. In Platinum, you get a somewhat impressive villa. In Platinum, you get the Pokétch. In Platinum, you could get quite a few legendaries, but not to the extent that it goes too far, like in Alpha Saphire/Omega Ruby. In Platinum, you get to visit the distortion world. In Platinum, you get to walk around with your starter Pokémon in the park. In Platinum, the legendaries have the most detailed backstories, as they are part of the history of the universe. In Platinum, there is an underground network of tunnels for secret bases across the entire region. In Platinum, you get to interact with the Pokémon that created the universe.... I could go on, but I will state the biggest negatives in Platinum, at least in my mind: they nerfed Cynthia, and the saving time is still somewhat long.
I haven’t played heartgold, but I will still argue that Platinum is better.
And I will argue this to my dying Breath. And then I will Return to continue to argue my point.