Well I don't remember too many Silver Age stories.
But I do have some favorites
First there was a Prestige Worlds Finest by Dave Gibbons and Steve Rude. It is a fun story with beautiful art.
The second one I really love which a Superman/Batman Annual 1 about their first team up.
But the last and best one imho is something called Dark Knight over Metropolis. First i will give some back story... After the Crisis there was only one piece of kryptonite(which was made into a ring) on the planet earth and it was stolen from Lex Luthor by an employee he fired. Anyway the employee is killed by some thugs and the ring is lost and picked up by a random homeless guy who goes to Gotham. With that information begins one of the most fascinating and personal Superman and Batman stories and it has a powerful ending. When I think of Superman and Batman and their relationship...the ending of that story crystallizes it more than anything Byrne and Miller said.