@fasttime
Personally I think very few teens are awful all the time or delightful all the time.
I find my dd delightful most of the time. My dh finds her hard work. It's more about our own personalities than the teen to be honest.
All of my dd's friends appear to be delightful! I'm sure they are not in their own homes!
I think there is a lot of truth in this - especially the last sentence.
I also think it's a great deal the luck of the draw, and the way personalities work with each other.
I have three teens. One has always seemed to sail through life and is probably one of your 'delightful' teens. Most of the time I find her very easy company and it's rare for us to annoy each other. She's slightly more impatient with DH. I feel good at knowing when to step in and when to back off. She's not perfect, but it's pretty easy most of the time.
One is much more spiky and difficult - quick to anger, strong perfectionist tendencies, easily stressed and lashes out when she's not happy. I find her much harder to read and manage. She can also be incredibly thoughtful, has a strong sense of justice and is a lot of fun. I think it's a chicken-and-egg thing - she finds life more difficult, her behaviour is less pleasant, the world responds to her less well, she finds life more difficult - but I often have no real ideas how to change it. Again, she's lovely outside the house.
Last one is still in the foothills of puberty really, so the jury's out there.
To a large extent, we're all doing the best we can - I think you're lucky if this bit is easy. And I'm always telling the kids there's a danger in comparing your inner life with other people's presentation of their outer life. I'm sure some of those delightful teens you mention have their own issues and problems sometimes.