Re: Who is the superman in your mind?
The definitive Superman in my head is John Byrne's Man of Steel Superman, and Reeve in Superman III. He just seemed the most heroic, commanding and don't-mess-with-me in the third movie. Plus he was in the best shape.
There is no Marvel/DC rivalry. Most of the great comic creators worked for both; Jack Kirby, Frank Miller, Grant Morrison, Walt Simonsen, Gil Kane, Steve Ditko, John Byrne, Steve Englehart, Mark Waid...even Stan Lee.