Out of curiosity, have you had legit GG4 to compare? I don't get heavy pine, more husky artificial chocolate (think tootsie rolls) that smoothes into milk chocolate, dark chocolate, and then creamy coffee notes as the cure matures. Do you have access to the cut?
I've experienced two types of "pine": The subdued straight piney smell (similar to an air freshener), and the chemical cleaner pine (like pine-sol). The Xmas Bud will throw phenos of both pine profiles (I've found more pine-sol types) and I have some preserved;
@HydroRed beat me to it
. You'll find pine-sol notes in certain OG's, but nothing as intense or reliably present accross all phenos as the Xmas Bud.
Be warned, these Xmas plants have almost no stretch to them, so make sure to veg them out with a ~25% stretch in mind. Since they stay so compact, they are not heavy feeders.