I would say that carpets are more of an intermediate snake, but that's just me.
They are nippy little things when they're babies and usually grow out of it, but it's still not incredibly uncommon to have a nippy, unpredictable adult. Jungles seem to be more aggressive than coastals but coastals do grow bigger. They are morelia of course, so the bites are not fun either when they're adults.
....If I were you, I would be looking at a male BCI boa. They'really almost always relaxed and docile, very rarely refuse meals, and they're easy to care for.