This is what I spent most of the '70s reading, Superman, as drawn by Curt Swan, and written by the likes of Elliot S! Maggin, Cary Bates and Denny O'Neill. This book contains reprints of some of the first comics I can remember reading. As a kid I always liked Superman because he was unambiguously good and extremely tough, but he still had problems he couldn't solve by brute force.
This collection reflects the changes DC editorial made to the character and his circumstance; Clark Kent works for a tv station, not a newspaper, his antagonist at work is Steve Lombard, not Lois Lane. They manage to update Superman without killing off his supporting cast or giving him a hip, new costume. They accept Superman as being the IBM of superheroes, not adventurous or dramatic, but reliable.
One thing that strikes me about these stories is the way the writers are delicately pushing the boundaries of what you can do in a Superman comic, but they do it in the DC style, without the angst and grandiosity you would find in Marvel comics. They introduce a parallel Earth and give us a thinly-disguised (even to my 7 year old eyes) Captain Marvel knock-off, and delve into social relevance, turning Lois Lane black to go undercover. They take concepts that could be edgy or mindblowing and put them into the context of a Superman comic without making the reader feel lost.
The stories in this collection are not timeless classics, they are not that ambitious. But they are solidly entertaining, with beautiful Curt Swan art and a playful attitude that respects the reader and the character.