Well.....interesting comparison...different approaches to rock and pop with these two.
Elton is a pop maestro with wonderful lyrics by Bernie....though he tries to get 'heavy' at times with songs like Madman Across The Water , radio friendly rock is where he sits ...Your Song, Bennie and the Jets, Rocket Man.
Bruce represents American iconic rock and roll with blues and folk thrown in and Dylanesque lyrics and posturing. Songs like Blinded By The Light, Born To Run, Prove It All Night, and Hungry Heart capture the core American culture of the 20th century and rock 'n roll.
Having said all that.....I would probably go with Elton's first 7 lps over Bruce's first 7 simply for melody and pure listening pleasure. They are comforting in an easy listening manner.